One of the easiest ways to calculate ovulation is to determine the ovulation from the basal body temperature. By measuring the temperature immediately after awakening and plotting, it is possible to predict the onset of ovulation 1-2 days before the onset. This method is used not only by women who want to increase the chances of becoming pregnant, but also by those who want to observe the processes taking place in their bodies in order to better study it.
How to determine ovulation at basal temperature?
You can start drawing a schedule on any day of the menstrual cycle, but it's better to do it from the first day. The measurement must be made every morning without getting out of bed, and always at the same time. You need to choose one method of measurement (rectal, vaginal or oral) and use it only throughout the cycle.
The duration of the vaginal or rectal basal temperature measurement is 3 minutes; Oral - 5 minutes, while the thermometer must be placed under the tongue and close your mouth. When measuring with a mercury thermometer, it is recommended to shake it before going to bed, since the efforts that you put into it in the morning can affect the result. Try to note any changes in the schedule within a month - changing the thermometer, deviating from the time of measurement, stressful situations, drinking, illness, physical activity and so on.
How to calculate ovulation at basal temperature?
To begin with, it is necessary to compile a BT table, in which the measured temperature should be inscribed opposite the date, and in the next two columns the nature of the precipitates and external factors. Then, based on the recorded indicators, draw a graph of the basal temperature . The schedule should be made on a blank sheet of paper in a box.
In the follicular phase of the cycle, BT is 37-37.5 degrees, and from the second phase (12-16 days), slightly 12-24 hours before ovulation, decreases slightly. The basal temperature during ovulation can reach a value of 37.6-38.6 degrees and at this level to keep until the beginning of the next menstruation. The period from the onset of menstruation to the time when the basal temperature is kept at a high mark for at least 3 days is considered fertile. Elevated temperature throughout the menstrual cycle may indicate pregnancy.