You can’t ovulate and get pregnant during your menstrual period. The follicles are immature at this time, so even if you have intercourse, you will not get pregnant. However, it is not recommended to have intercourse during menstruation. If you have intercourse at this time, there is a high risk of infection, such as endometritis, which, if serious, can lead to infertility in the future. If you want to conceive quickly, it is best to have intercourse during ovulation. Ovulation is usually about 14 days before the next period, when you are in the ovulation period. Having intercourse during ovulation can greatly increase the chances of conception. Nowadays, ovulation can also be monitored by ultrasound, which is more accurate. When the follicles are confirmed to be mature and about to ovulate, the doctor will guide the couple to have intercourse, which will greatly increase the chance of pregnancy.