Here are some simple steps to use in creating an ovulation calendar based on your BBT.
- Prepare your ovulation calendar system by placing a digital thermometer (for speed and accuracy) and your BBT chart within easy reach of your bedside (sample chart shown below).
- Using graph paper, your BBT chart should have four rows across the top of the page, with an extra-tall fifth row across the bottom of the page.
- Label the first row as Day/Month, and fill in each day of the upcoming month, beginning on the first day of your period.
- Label the second row to show the days that you have intercourse (filled in with an "I")
- Label the third row to show the days of your period (filled in with an "X")
- Label the fourth row to show the day of your menstrual cycle (with the first day of your period as "Day 1".
- In the fifth row, mark indices for your BBT from 99.0 at the high end to 97.0 at the low end.
- Each morning, try to wake at a very consistent time (this matters quite a bit) and take your temperature before rising or doing anything else.
- Record your temperature daily under the Day/Month column first filled in above, as well as any other important information such as days of your period, illness, or having intercourse.
- If you become ill or have any other significant change in your schedule that could affect your BBT reading, be sure to make a notation on the ovulation calendar -- relatively mild changes in your routine can affect your BBT.
- Over the course of your monthly ovulation cycle, draw a line from one temperature reading to the next to create a line graph of your BBT.
- Be sure to begin a new BBT chart when its time for your next period to begin.
Once you've collected your BBT information, you will have an ovulation calendar that shows you when you've most likely ovulated. In a normal cycle, a woman's temperature will drop to around 97.0 to 97.5 Fahrenheit just prior to ovulation and then rise to a range of 97.6 to 98.6 following ovulation. You can use this information to determine how regular your ovulation cycle is and to pinpoint the approximate time of the month that you should be able to conceive.
However, the BBT method will not tell you if you've actually ovulated or if your ovulation occurs at an unusual time within the ovulation cycle.
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Ready to check out additional ovulation prediction methods with higher reliability? Click below to look at:
Ovulation Calculators
Ovulation Test Kits
Fertility Monitors
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