Basal temperature before menstruation (graph): a week before menstruation

Basal temperature measurement helps not only to track the beginning and end of different phases of the cycle, calculate the most favorable days for conception, but also draw a conclusion about the state of reproductive health systems. BT indicators, which are within the normal range, indicate a favorable hormonal background, the absence of inflammatory processes, hidden gynecological pathologies.

The basal temperature before menstruation can give a woman information about whether fertilization has taken place in this cycle, and whether the early stage of gestation is normal, if the pregnancy has taken place.

Determination of basal temperature

Basal temperature - these are indicators obtained during measurements with a thermometer on the surface of the mucous membranes of the body. Translated from the Greek language, the term basal is translated as basic, meaning the thermometer marks that are closest to the physiological ones inside the body. Natural BT is recorded in healthy girls who have no abnormalities in the reproductive sphere, hormonal disruptions.

Today, many women have abandoned the method of measuring basal temperature, although it allows you to determine the stage with high accuracy monthly cycle, identify the most suitable days for fertilization, give the gynecologist a lot of information about the state of reproductive organs.

You can get reliable BT indicators by taking measurements in a calm state, in one of the natural holes:

• mouth;
• vagina;
• rectum.

Measuring the temperature in the armpit is not very informative, since it reflects only external indicators, which rarely rise above 36.6 ° C in the absence of pathologies.

The goals of its measurement in gynecology

Usually they draw up charts of basal temperature before menstruation and find out what it should be for women who want to get pregnant and have a baby as soon as possible. They use several methods at the same time to calculate the most favorable days for fertilization.

Menstruation cycles

The base temperature allows us to draw a conclusion about how the hormonal background has changed and how a certain cyclic stage affects it:

Follicular phase

The beginning of the first phase is marked on the first day of menstruation, it normally lasts 14 days. At this time, follicles grow in the appendages, one of which will become dominant and displace the rest - it will be the carrier of a mature egg, ready to merge with the sperm. Before ovulation itself, BT decreases sharply, since estrogen does not have such a significant effect on indicators as progesterone.

Luteal phase

Before menstruation, women who want to become pregnant can judge whether conception has occurred according to the BT indicators obtained in the second phase of the menstrual cycle. Thanks to the hormone progesterone, there is an accelerated increase in the basal marks of the thermometer - inside the uterus a thick epithelial layer is created that can hold the fertilized gamete for gestation continued.

In the absence of conception, the basal temperature, measured before menstruation, will become lower, as the corpus luteum, formed to support pregnancy and producing progesterone, atrophies. A drop in the level of the hormone in the blood reduces BT and a woman can make an independent conclusion that pregnancy has not occurred.

Rules for measuring BT at home

In order to qualitatively track how many days before the start of menstruation, BT falls, whether it rises immediately after ovulation (whether the reproductive organs are fully performing their functions), it is important to strictly observe the rules for measuring the basal indicators:

1. Measure temperature immediately after waking up if sleep was continuous for 5-6 hours in a row.
2. Try to take measurements at the same time with an interval of no longer than half an hour, preferably during the maximum peak of hormone concentration (from 05 to 07 in the morning).
3. Use one thermometer, preferably a regular mercury thermometer - it is more accurate and does not give errors.
4. Put the thermometer nearby so as not to get up and not make sudden movements (you need to shake it off in the evening).
5. After waking up, it is forbidden to move intensively, go to the toilet and even sharply stretch in bed.
6. Keep an electronic thermometer in the anus for 3 minutes, a mercury one for at least 5–7 minutes, immediately write down the result in a notebook.
7. Immerse the thermometer into the anus to a depth of 2-3 cm, having previously lubricated it with baby cream, oil or petroleum jelly.
8. Do not have sex, stop eating salted, fried and fatty foods, fast food 4-5 hours before measuring BT.

If the column of the thermometer is at a dubious value, you need to fix the lower division in a notebook. In the event of any incident, if a woman got out of bed in the morning, took strong sleeping pills before going to bed, was nervous or violated the regimen, this should be recorded.

Norms of temperature indicators in different phases of the cycle

In the table below, you can familiarize yourself with the BT norm before menstruation, during the period of bleeding and immediately after it ends. With the help of this data, you can calculate the ovulatory phase and choose a favorable moment for conception.

Cycle phase	Day of the cycle	Phase Control Substances	BT indicators, which should be normal
Follicular	1–13	Estrogen, follicle-stimulating hormone	36.3 - 36.5 ° C
Ovulation	14–15	Estrogen, luteinizing hormone	Decrease to 36.2–36.3 ° C. Follicle opening 36.4–36.7 ° C At the end of ovulation 37-37.4 ° C
Luteal	16–28	Progesterone	37.1-37.5 ° C

During menstruation

The normal basal temperature for menstruation is 36.7-37 ° C, since the influence progesterone, which makes the endometrium of the uterus loose and prepared for the introduction of a fertilized gamete into it, is not yet ended. During critical days, many women feel lethargic, lack of energy, suffer from headaches, nausea.

Symptoms appear because menstruation is a kind of stress for the female body, a lot of fluid and blood is lost, with which accumulated toxins come out. On the third day of menstruation, the basal rates drop to 36.4–36.5 ° C, on the fourth and fifth days they become even lower - 36.2–36.3 ° C.

After menstruation

At the end of menstruation, the follicular phase is in full swing. Under the influence of estrogen and follicle-stimulating hormone, follicles grow, in one of which the egg will mature. These hormones do not strongly affect the thermoregulation processes in the small pelvis, which is why the rectal temperature will remain in the range of 36.4–36.5 ° C. The period in which the gamete leaves the dominant follicle and enters the uterus is called the low temperature phase. If a woman marks 36.3 ° C on the thermometer, then ovulation will occur after 1-2 days.

During the ovulatory phase, the thermometer rises by 0.2-0.4 ° C - this time is the most favorable for intercourse and fertilization of the egg with a sperm. Immediately after ovulation, the temperature is 36.9–37.2 ° C. If you manage to make intimate contact within 24-48 hours while the gamete is in the uterus, it will lead to pregnancy.

Before the onset of menstruation

What should be the basal temperature before the onset of menstruation and with the onset of pregnancy - if fertilization did not take place, BT will gradually fall to 36.7-36.9 ° C, and after the start of critical days it will drop even stronger.

If conception nevertheless occurred, this fact can be suspected by the increased base temperature that persists up to the menstruation itself - 37-37.5 ° C.

In a situation with the onset of pregnancy, in anticipation of the next menstruation, which will not come, a woman can note the following graph of temperature fluctuations:

1. Fertilization day - 36.5–36.7 ° C (it is not yet possible to determine that the gamete has fused with the sperm by BT, you need to wait for the release of the ovum and its implantation into the uterine wall for 7–10 days).
2. The introduction of the embryo into the endometrium - the basal marks decrease to 36.3–36.5 ° C (implantation retraction).
3. 2-4 days after implantation of the fetus into the uterus - BT readings increase to 37 ° C.
4. The next 1-2 weeks - the temperature will not drop below 37 ° C, normally after conception the thermometer shows up to 37.4-37.5 ° C.

If a woman records an increased level of BT for almost a week in a row on the eve of the expected menstruation and wants to know sooner whether conception has occurred, she should donate blood to determine the amount of hCG. This test is most sensitive to hormone levels, unlike a test, and will show conception after 7-10 days.

Why does the basal temperature remain elevated before the onset of menstruation

Normally, the basal temperature should drop before menstruation from 37 to 36.7-6.8 ° C - if this does not happen, in addition to the onset of pregnancy, one can suspect the presence of some pathologies that support the overestimated BT indicators:

Inflammatory processes in the small pelvis

Inflammation leads to a violation of thermoregulation, blood flow to the appendages and the uterus, which is why BT is kept at a higher level than it should be.

Spontaneous ovulation

With sharp hormonal disruptions, the release of the egg occurs much earlier or later than the required time. If, just before the onset of menstruation, BT is increased to 37 ° C, this indicates a recent entry of the gamete into the uterus and the expected delay in menstruation. You should go to an appointment with a doctor to study hormonal levels.

Repeated ovulation

It happens that BT decreases closer to the beginning of menstruation to the prescribed levels of 36.8 ° C, a woman is convinced that that conception did not occur and is waiting for critical days, and the thermometer again rises above 37.3 ° C. The symptom is caused by repeated ovulation - a rare occurrence when two eggs mature in the follicles at once. If one of them has already entered the uterus and has not been fertilized, the second leaves the ovary just before menstruation, creating a repeated BT peak.

BT readings above 37.5 ° C before menstruation are pathological and require a doctor's comment, since they indicate the presence of an acute inflammatory process in the small pelvis.

Temperature indicators at the onset of conception

What will be body temperature during early pregnancy before delay? It will not be possible to determine whether fertilization occurred in this cycle by basal temperature a week before the start of menstruation - at at this stage, while the active stage of the luteal phase lasts, under the influence of progesterone, the thermometer indicators will be increased. Later, after 7-10 days, just before the onset of menstruation, the thermometer marks will be able to more confidently answer whether the pregnancy has taken place.

In women with an unstable long cycle (32–35 days or more), menstruation may come earlier or later, which is why it is not always possible to guess about perfect fertilization before the delay. By the time a lady begins to worry that there is no menstruation for more than 35 days in a row, she may be diagnosed with 1.5-2 weeks of pregnancy. BT rates in the early stages and the reasons for deviations are shown in the table.

Fertilization period in weeks	Obstetric term in weeks	BT norm in oC	Factors affecting the change in normal BT
1	3	36,9–37,4	Decrease - the threat of spontaneous abortion, increased temperature - an acute inflammatory process
2	4	37,2–37,6
3	5	37,2–37,7
4	6	37,2–37,7	If the indicators fall and their subsequent sharp increase to 37.9-38 ° C, one can suspect a frozen pregnancy

Abnormal basal temperature marks

Not always, the basal temperature before the onset of menstruation remains in normal ranges, both at the onset of conception and outside of pregnancy. If a woman regularly writes down BT indicators in a notebook and plots graphs for several cycles in a row, she should consult a specialist when she notices serious deviations in the marks thermometer. A temperature indicating conception at 37-37.5 ° C on the eve of menstruation is a reason to immediately confirm or deny the fact of pregnancy using a blood test or ultrasound diagnosis.

Why indicators can go down

A woman should monthly observe how many days before the onset of menstruation her basal temperature drops in order to be ready to diagnose possible fertilization - usually BT indicators decrease one day before menstruation. If the thermometer confidently gave 37.5 ° C for almost a week, which indicates successful fertilization, and then the indicators sharply decreased, this may mean:

• the threat of spontaneous abortion;
• incipient miscarriage;
• frozen pregnancy at the earliest possible date;
• progesterone deficiency.

Lowered, compared to normal, basal marks may be individual for a woman. If during ovulation she records the temperature at a peak of 36.7–36.8 ° C, then the indicator of 36.9–37.1 ° C after conception is not a deviation from the norm for her.

Elevated Basal Marks Before Menstruation

The answer to the question of what temperature should be in the rectum before menstruation depends on whether pregnancy has occurred in the current cycle. If conception has occurred, normal readings should be 37–37.5 ° C, outside of pregnancy, before the onset of menstruation, the thermometer should show 36.7–36.9 ° C.

In pregnant women, an increase in basal marks up to 38 ° C indicates the following problems:

Ectopic pregnancy

At a period of 2-3 weeks, it can manifest itself with pulling pains in the lower abdomen, mainly on the one hand, general hyperthermia, weakness, and a decrease in blood pressure. Later, bloody vaginal discharge of a smearing nature joins the symptomatology, the pain sensations increase. At this stage, it is important to go to the hospital right away to avoid tube rupture and internal bleeding;

Risk of miscarriage

Symptoms of the threat are aching abdominal pains radiating to the lower back, deterioration of health, weakness. If you go to the hospital on time, the doctor may prescribe progesterone drugs to the patient to prolong gestation.
Outside of pregnancy, if the basal temperature has increased, this may indicate acute and chronic inflammatory processes (in the small pelvis, intestines, stomach). These pathologies include adnexitis - inflammation of the ovaries. The disease is characterized by symptoms of pulling pain in the abdomen, pain during bowel movements and urination, an increase in overall body temperature to 37.5–38 ° C. Sometimes the patient's condition deteriorates so much that she needs urgent help in an inpatient setting.

Also, an overestimation of basal levels up to 38 ° C causes diseases:

Endometritis

Acute bacterial infection affecting the endometrioid layer of the uterus. It develops after abortions, miscarriages, diagnostic curettage and operations on the uterus. It manifests itself as weakness, the release of sticky sweat, a sharp deterioration in well-being. From the genital tract, there may be bloody discharge mixed with pus or mucus.

Sexual infections

These include thrush, chlamydia, ureaplasmosis, mycoplasmosis, trichomoniasis, gonorrhea. In addition to discomfort in the lower abdomen, a woman develops a vaginal discharge with a repulsive, unpleasant odor, having an unnatural color (green, yellow, gray, white with curdled consistency);

Diseases of the genitourinary system

With cystitis, inflammation of the walls of the bladder occurs. The lady cannot urinate normally, there is a constant feeling of overflow of the bladder. During a trip to the toilet, there are cutting pains in the lower abdomen and a burning sensation in the urethra. The body temperature rises to 37.5–38 ° C.

A high basal temperature on the eve of menstruation and when they did not start on time should be a reason for contacting a doctor, especially if there are dangerous signs: deterioration of health, weakness, acute pains below belly.

Basal temperature measured in compliance with all the rules will allow a woman to determine the presence or absence of problems with the reproductive organs, to calculate the days favorable for conception. Each girl is advised to learn how to correctly draw up a schedule in order to contact a specialist in time when sharp deviations from the norm appear.