Story about Menstruation, Ovulation, and Basal Body Temperature: Part 2

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In the previous article, we explained the mechanism of menstruation and ovulation. To get pregnant, it’s important to have regular menstruation and ovulation. Otherwise, it may hard to get pregnant.

In this article, we will talk about basal body temperature for ovulation.

Take your basal body temperature

The first thing we would like women who are trying to get pregnant to do is to take their basal body temperature every morning. By taking your basal body temperature, you can roughly predict your ovulation date. Basal body temperature is the temperature of your body when it is in its most restful state, such as while you are sleeping. When you wake up in the morning, you can take your temperature right away in bed or under the covers without moving.

Unlike men, women’s body temperature changes, and it goes up and down depending on the secretion of hormones. It can be divided into two phases: the low temperature phase and the high temperature phase.

The low temperature phase is the period from the start of menstruation until ovulation occurs. The low temperature phase is the period from the start of menstruation until ovulation occurs, and the high temperature phase is the period after ovulation when the body temperature rises due to the secretion of luteinizing hormone. If you are pregnant, the high temperature period will continue, and if the egg is not fertilized or implanted, menstruation will begin around 14 days after ovulation.

If your basal body temperature is normal, you will see a two-phase graph like this, but if your high temperature period is too short, if it does not divide into two phases, or if the lines on the graph are uneven, it is a good indication that there is something wrong with your body, including irregular periods (if the high temperature period persists, pregnancy is suspected).

 When the high temperature period is short

The high temperature period begins after ovulation, and normally lasts more than 10 days. If it is less than that, luteal insufficiency is suspected.

When the high temperature period is long

If the high temperature period lasts for more than 14 days, the possibility of pregnancy should be considered. In addition, you may have an ectopic pregnancy or another cause, so see your doctor as soon as possible.

If the graph is not divided into two phases (anovulatory cycle)

Anovulatory menstruation should be suspected. Even if you think you are menstruating properly, there are times when ovulation does not occur and you experience bleeding like a menstrual period, called failure bleeding. The endometrium thickens slightly with trace amounts of hormones, and then it gets old and comes out. Since there is no ovulation, it can be said that there is no change in body temperature.

If the lines on the graph are uneven

If you have been living an irregular life, such as not getting enough sleep or not waking up at the same time, you may have anovulatory menstruation as well as those who do not have two phases.

In some cases, you may simply not be taking your temperature properly, so it’s best to double-check the situation when you take your temperature. It is also possible that the thermometer is faulty, although this is rare.

How to take your basal body temperature

As soon as you wake up in the morning, put the tip of the thermometer under your tongue and measure it. To get a closer approximation of your body’s temperature while you are asleep, do not move and take the temperature in the blanket.

It is important to take the temperature at a regular time. It is convenient to keep a thermometer and a basal body temperature chart to write down your basal body temperature by your bedside table so that you don’t have to get up.

Knowing your ovulation date

The day of ovulation can be roughly predicted by basal body temperature as mentioned above, but it can also be predicted by cervical mucus.

As the follicle develops, estrogen (E2) is released, which causes the cervical mucus to increase. The vagina is kept acidic to prevent the entry of bacteria, but as the day of ovulation approaches, the cervix, which is the pathway for sperm, secretes more alkaline mucus due to estrogen.

As the day of ovulation approaches, estrogen causes the cervix, which is the pathway for sperm, to secrete more alkaline mucus, which encourages the movement of sperm, which dislike acidity. The cervical mucus is characterized by its egg-white consistency and its ability to stretch like a string.


If your basal body temperature changes or your discharge changes, it means that you are close to ovulation or have ovulated. You can also use over-the-counter test strips to measure the level of luteinizing hormone (LH) in your urine to determine your ovulation date.

Although it is not as accurate as an ultrasound or blood sample taken at a hospital, it may be a good idea to use it together with your basal body temperature chart as a rough guide to your ovulation date.

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