If she gets her period on the 15th of every month, her menstrual cycle is 28 days. So, if she starts having withdrawal bleeding on day 14 of her menstrual cycle, she may start ovulating on day 10 of her menstrual cycle.

However, the exact timing of ovulation may be affected by a variety of factors, such as a woman's menstrual cycle, health, diet, and exercise. Therefore, if a woman is unsure about her ovulation period, it is recommended to consult a doctor or professional advisor.

In addition to the ovulation period, women also need to pay attention to other important periods. For example, the 10th to 14th day of the menstrual cycle is a safe period, but it is not absolutely safe. In addition, women also need to pay attention to the first 7 days and the last 8 days of the menstrual cycle. These periods are also dangerous periods for women.

In summary, women should pay close attention to their period dates and understand their bodies and cycles to better understand their health and chances of pregnancy.