I have my period on the 13th, when is the ovulation day?

To determine when a woman is ovulating, doctors often use a number of indicators. These indicators include body temperature, basal body temperature method and calendar method.

The basal body temperature method means that women measure their oral or anal body temperature every morning when they wake up. Generally speaking, a woman's body temperature changes during different stages of the menstrual cycle. During ovulation, a woman's body temperature will rise by about 0.3-0.5 degrees Celsius.

The calendar method means that women record their body temperature changes every day according to the time of their menstrual cycle. Generally speaking, it is safe for women to get pregnant in the first 7 days and the last 8 days of the menstrual cycle. These days are also called the most fertile periods.

Through the above methods, women can determine their most fertile periods and take necessary measures to protect their fetuses during this period.

It should be noted that the above methods are only suitable for healthy women. If a woman has a chronic medical condition or is taking medications, consult a doctor before using these methods. Additionally, if a woman is unsure of her fertile days, she can also consult a doctor or calendar expert.