Basal Temperature and Pregnancy: What You Need to Know

January 19, 2024

Pregnancy is a fascinating and overwhelming time, full of changes and discoveries. One of the tools that can help us better understand the dynamics of the menstrual cycle and pregnancy is basal temperature. But what is it exactly and how does it relate to pregnancy? In this Parentalife article, we will try to answer these and other questions related to temperature during pregnancy.

What does basal temperature look like when you are pregnant?

Basal temperature is the lowest body temperature in 24 hours, usually measured before getting out of bed in the morning. During pregnancy, your body temperature can undergo significant changes. Typically, a rise in basal temperature occurs between ovulation and the menstrual period. If the temperature remains elevated for more than 18 days after ovulation, a woman can be pregnant.

During pregnancy, basal temperature generally remains high. This is due to increased levels of progesterone, a hormone that increases body temperature. However, it is important to note that every woman is different, and not all pregnant women experience an increase in basal temperature.

What should basal temperature look like after conception?

After conception, basal temperature usually remains high for the duration of the pregnancy. This is due to increased levels of progesterone, which increases body temperature. You may notice an increase in temperature of 0.5 to 1.0 degrees Celsius after ovulation, which will remain at the same level if you are pregnant.

However, it is important to remember that measuring this temperature is not a foolproof method for determining pregnancy. While a substantial and continuous rise in basal temperature may indicate pregnancy, there are also other reasons why basal temperature may rise. For example, stress, illness, and lack of sleep can all cause a rise in basal temperature.

When does the temperature start to rise?

Basal temperature begins to rise soon after ovulation, usually within three days. This rise is a sign that the body is preparing for pregnancy. If the temperature remains high for 18 days or more, a woman may be pregnant.

How to tell if a woman is pregnant?

Some many signs and symptoms that can indicate pregnancy. In addition to increased basal temperature, other common symptoms include a delayed menstrual cycle, nausea (also known as morning sickness), increased urinary frequency, fatigue, sensitive breasts, or bloating.

However, the safest way to confirm a pregnancy is with a pregnancy test. These tests measure pregnancy hormone (hCG) levels in the urine. You can perform a pregnancy test at home, or you can do it at a medical office or clinic.

How can you tell if you are pregnant?

If you are looking for signs of pregnancy, you are probably paying close attention to your body. In addition to rising temperature, you may notice other symptoms such as nausea, painful or swollen breasts, fatigue, food cravings, and increased urinary frequency.

Remember, however, that these symptoms are not proof of pregnancy and may be caused by other conditions or hormonal changes. If you think you are pregnant, the best way to know for sure is to take a pregnancy test.


Basal temperature can offer valuable insight into the hormonal changes that occur during the menstrual cycle and pregnancy. However, it should not be used as the sole tool for determining pregnancy. If you think you are pregnant, it is important to talk to your doctor or a health care professional. Remember, every woman is unique and every pregnancy is different. Therefore, it is important to listen to your body and seek medical assistance when needed.

At Parentalife we support you with our courses and consultancies, feel free to contact us if you need help.


Steward K, Raja A. Physiology, Ovulation And Basal Body Temperature. [Updated 2023 Jul 17]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from:

About the Author

Severino Cirillo

Health, Wellness and Education Expert. With a degree in Community Health, he is the CEO of Informed Parent and is responsible for validating the blog's scientific information and coordinating the editorial team of experts, consisting of gynecologists, midwives, psychotherapists, and others in pregnancy, perinatal, and parenting wellness and health.