Jump to content. The basal body temperature BBT is a person's at-rest temperature. Women can track their BBT to find out when they are ovulating. With this time line, a woman can learn when she is most and least likely to become pregnant. About 2 weeks before your period you will ovulate , which means that one of your ovaries has released an egg.
You are most likely to get pregnant on the day of ovulation and the 5 days before it. Your egg is fertile for about 12 to 24 hours after you ovulate. Avoiding sex until several days after ovulation may help you prevent pregnancy. Keep in mind that your cycle can change, making it hard to know when you are ovulating. Some women use this information as a form of birth control. But it isn't very reliable for preventing pregnancy. These have been shown to be unreliable and we do not recommend them.
Salivary ferning microscope tests will sometimes even show that men and post-menopausal women are ovulating. Clearly, these results cannot be interpreted with any confidence. Ovulation Testing What is ovulation testing? Types of ovulation testing Tests of ovulatory function include basal body temperature charting, ovulation predictor kits and timed serum progesterone levels. Basal body temperature charting technique Obtain a BBT thermometer, available at your drug store. Place the thermometer at your bedside.
The day after your menses begin, start recording your temperature. Each morning, upon waking and before rising or any morning activity, and before drinking anything, take your temperature. Record the temperature on a BBT graph. Keep recording on a daily basis until your next menses begins. The temperature should remain elevated for at least 11 days. If you do not get a temperature rise, or if the rise does not last 11 days, consult your doctor. As seen below, a normal temperature rise will last for a minimum of 11 days.
It can take up to three days after ovulation for the temperature to rise. However, in our experience most women experience temperature rises on the same day or a day later than when an ovulation predictor kit turns positive. The BBT chart shows ovulation with an adequate duration of the luteal phase. Notice that the temperature stayed elevated for 11 days or more. This BBT chart shows ovulation with a short luteal phase. However, BBT alone cannot predict when ovulation will occur in the future.
BBT is slightly lower in the follicular phase the first half of the menstrual cycle , and rises after ovulation and stays raised throughout the luteal phase the second half of the menstrual cycle 2,3. This rise in temperature happens in response to progesterone, which is released after ovulation occurs. Progesterone prepares the uterus for the implantation of a fertilized egg. By following rules that combine the changes in BBT with carefully-tracked changes in cervical mucus, the most fertile days of the cycle can be estimated i.
Average basal body temperature will vary between individuals, and depending on the time of the day and the activity. You suspect that you are pregnant. Download Clue and start tracking your basal body temperature. Are vaginal fluids really all that different? If you're not ovulating, you can't get pregnant. If you are ovulating irregularly , it may indicate a possible infertility risk. Lack of ovulation is called anovulation and is a common cause of female infertility. Most women with anovulation can take fertility drugs , which will trigger ovulation and hopefully help them get pregnant.
Yes and no. Many women read into every little temperature fluctuation. It's part of the two-week wait obsession and the never-ending search for early pregnancy signs. There are four ways a BBT chart can indicate a pregnancy the possibility of pregnancy. You can only know if and when you ovulated a few days after it happened in a BBT chart. You can look back on your chart and determine this. You are most likely to conceive if you had sex on the two days preceding ovulation.
If you have an implantation dip on your BBT chart : An implantation dip is a one-day drop in temperature about a week after ovulation. The majority of the time, an implantation dip is nothing more than a mid-cycle dip in temperature and does not indicate pregnancy. If you have a triphasic pattern on your BBT chart : A triphasic temperature pattern is a second temperature increase occurring about one week after ovulation. Seeing a triphasic pattern on your BBT chart is slightly more likely to indicate a potential pregnancy, but it is also no guarantee.
A triphasic pattern indicates that progesterone rose a little bit more, causing your temperatures to also rise slightly more. If your luteal phase is longer than normal : The most reliable way to detect pregnancy on a BBT chart takes patience. The old-fashioned method: By waiting to see if your luteal phase —the time between ovulation and your expected period—is longer than usual. If you see that your luteal phase has gone at least one day past the usual length, you might be pregnant.
This is a good time to take a pregnancy test. Not many women can wait that long without taking a pregnancy test. Still, it is the strongest early sign of pregnancy detectable with a BBT chart. A Word From Verywell. Basal body temperature charting is a great way to track your cycles and ovulation patterns. It can also help your doctor detect possible ovulatory infertility. When it comes to detecting pregnancy, BBT charts can only offer small hints. You can't confirm pregnancy with a fertility calendar.
We know how tempting it can be to look for early signs of pregnancy, and how stressful it can be waiting to take a pregnancy test. However, since there are no reliable ways to detect conception without "peeing on a stick," the best way to use your time and energy during the two-week-wait is to focus on self-care and to distract yourself with your life beyond trying to conceive.
Get diet and wellness tips to help your kids stay healthy and happy. Detection of ovulation, a review of currently available methods. Bioeng Transl Med. Sharpe RM. Sperm counts and fertility in men: a rocky road ahead.
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