Ovulation and 1-2 days before and after the time of intercourse is easy to conceive, ovulation intercourse sperm can be combined with the discharged egg, thus forming a fertilized egg may lead to pregnancy. For women who normally have regular periods, the calculation of ovulation is relatively simple, from back to front projection process, ovulation is 14 days before the next menstrual period. For women with irregular periods, the calculation of ovulation requires other aids. In comparison, the most accurate method is ultrasound monitoring, which can be performed from about the 10th day of menstruation to monitor the follicles. Depending on the results of follicle monitoring and the timing of follicle ovulation to guide conception, the chances of pregnancy will be higher.