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How can you determine your "fertile time" so that you can plan baby making sex ? There are many methods which you can use to calculate the time you ovulate.

Menstrual period timing (Calendar method) To determine the length of the menstrual cycle, one only needs to note the date of the beginning of the menstrual period (first day of flow) for two consecutive periods, and then count the day from one date to the next. Keeping track of the length of menstrual cycles will help determine the approximate time of ovulation, because the next period begins approximately two weeks from the date of ovulation.

Read more- Ovulation Prediction Test Kits in India

The rough rule to calculate the approximate date of ovulation is : NMP minus 14 days, where NMP is the ( expected) date of the next menstrual period. This is because the luteal phase for most women is 14 days long.

Date of ovulation = NMP - 14

Keeping track of the menstrual cycle by charting it can indicate other ovulatory disturbances . For example, if a menstrual cycle that is normally 28 days starts to occur every 35 or 40 days, this may mean that ovulation is disturbed, and an evaluation is needed.

Basal Body Temperature (BBT) chart

During the luteal phase of the cycle, the corpus luteum produces the hormone progestrone, which elevates the basal body temperature. When the basal body temperature has gone up for several days, one can assume that ovulation has occurred. However, it is important to remember that the BBT chart cannot predict ovulation - it cannot tell you when it is going to occur !

Read more- Is BBT charting of any use for infertile couples

The useful tool 

The basal temperature chart can be a useful tool. It allows the patient to determine for herself if she is ovulating as well as the approximate date of ovulation, in retrospect. Basal body temperature charts are easy to obtain and the only equipment required is a special BBT thermometer.

General instructions for keeping a basal body temperature chart include the following :

  • The chart starts on the first day of menstrual flow. Enter the date here.
  • Each morning immediately after awakening, and before getting out of bed or doing anything else, the thermometer is placed under the tongue for at least two minutes. This must be done every morning, except during the period.
  • Accurately record the temperature reading on the graph by placing a dot in the proper location. Indicate days of intercourse wit
  • The major limitation of the BBT is that it does not tell you in advance when you are going to ovulate - therefore its utility in timing sex during the fertile period is small. Interpreting the BBT chart can be tricky for many patients - rarely do the charts look like those you see in textbooks!

A stressful task 

Also, keeping a BBT chart can be very stressful - taking your temperature as the first thing you do when you get up in the morning is not much fun. What is worse is that you start to let the BBT chart dictate your sex life. This is why though the BBT chart used to be a useful method in the past, it's utility is limited today - and newer methods are available which are more accurate are available.

Manufacturers have now incorporated a microprocessor along with the digital thermometer, to create an electronic fertility management device , called The Bioself Fertility Indicator. This makes calculation of the "fertile days" much easier, because it combines and optimises both the basal body temperature and calendar method of ovulation prediction.

Fertility Software Programs

Newer software programs ( easily available on the internet ) , such as CycleWatch, help you learn about your body's fertility signs by giving you the tools to document and analyze your observations. For women who are comfortable with computers, this is a useful tool to organize your cycle data and analyze your cycles to determine fertile times.

You can also use our free online fertility calculator to determine when you ovulate !

Authored by : Dr Aniruddha Malpani, MD and reviewed by Dr Anjali Malpani.

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