Everyone’s menstrual cycle is different, but the method of calculating ovulation is the same. If the menstrual cycle has been relatively regular, the ovulation day should be about the 14th day before the next period, so if you had your period on the 7th of last month, ovulation this month will be about the 22nd. However, because women’s endocrine secretion can be affected by many factors and changes, such as sudden changes in living environment, or recent work and mental stress, can easily cause ovulation to advance or postpone. Therefore, it is not necessary to ovulate on the exact day of ovulation every month. Generally, it is normal to ovulate 5 days before and 4 days after the day of ovulation. If you are preparing for pregnancy, as long as you have intercourse during the ovulation period, the probability of pregnancy is higher. You can also use ultrasound to monitor ovulation and find mature follicles and arrange intercourse in time, which generally has a higher probability of pregnancy.