Sexual intercourse during ovulation and menstruation are two very important aspects of reproductive health, but they are not independent concepts. In fact, they are closely linked and play a vital role in both pregnancy and fertility.

So, how to determine a woman’s menstrual cycle and ovulation? Generally speaking, a woman's menstrual cycle is affected by many factors, such as age, weight, diet, stress, etc. Therefore, the exact cycle and ovulation period cannot be determined. However, there are ways to determine a woman's menstrual cycle and ovulation.

First, a woman’s menstrual cycle and ovulation period can be determined by measuring her basal body temperature. Basal body temperature refers to the body temperature measured when a woman wakes up every day. By measuring basal body temperature, a woman's menstrual cycle and ovulation period can be determined. Under normal circumstances, a woman's menstrual cycle lasts about 30 days, and ovulation occurs around the 14th day of the menstrual cycle.

Secondly, a woman’s menstrual cycle and ovulation period can be determined by observing her menstrual symptoms. For example, symptoms before menstruation include breast swelling, headache, fatigue, etc. Symptoms after menstruation include headache, insomnia, depression, etc. These symptoms usually alternate between a woman's menstrual cycle.

Finally, a woman's menstrual cycle and ovulation can also be determined by using a calendar or fertility calculator. These tools can help women calculate their menstrual cycle and ovulation, and determine the best time to get pregnant.

In short, a woman’s menstrual cycle and ovulation play a vital role in pregnancy and fertility. By measuring your basal body temperature, observing menstrual symptoms, and using a calendar or fertility calculator, you can help determine your menstrual cycle and ovulation and ensure the best time to get pregnant.