If she gets her period on the 10th, her menstrual cycle is usually about 28 days. To figure out when she is ovulating, we need to consider her menstrual cycle and cycle length.

Therefore, a woman's menstrual cycle is an important factor that affects her fertility. A woman's menstrual cycle is usually divided into two phases: pre-cycle and post-cycle. A procycle is usually a few days before your period starts, and a postcycle is usually a few days after it ends.

So, how to calculate a woman’s ovulation period? A woman's ovulation period usually occurs around 14 days after the end of her previous cycle. This is because eggs usually only survive for about 14 days, so fertilization within a few days before or after this date can affect a woman's fertility.

In addition to calculating a woman's ovulation period, there are other ways to predict a woman's fertility. For example, a woman can predict when she will be ovulating by taking her body temperature.