Generally speaking, each menstrual cycle, both ovaries ovulate only one egg, and ovulation occurs approximately in the middle of the first day of two menstrual periods. However, it is recommended to consult your gynecologist to find the exact day by the following methods: measuring basal body temperature, ultrasound to monitor ovulation, ovulation test strips, observing the consistency of the leukorrhea, etc. After finding the ovulation period, when exactly should we have intercourse? There are 2 types of situations. For example, if ovulation is presumed on the 10th, you can have intercourse on the 9th night, or on the 8th, 10th and 12th nights respectively. In view of all the unfavorable factors in the current environment, if you find that you are pregnant, it is advisable to go to the hospital as soon as possible for examination and effective fertility preservation.