For women who are preparing for pregnancy, they may consider going to the hospital for an ultrasound on day 10 of their period to monitor the growth and development of their follicles in order to get pregnant as early as possible. If the ultrasound reveals that the follicle is 17mmx14mm, it is not considered a mature dominant follicle, but it is a dominant follicle. Usually the follicle grows to 18mm or more before it is considered a mature dominant follicle and may be eliminated from the ovary at any time. Therefore, once the follicles are found to be above 18mm, you need to do daily ultrasound monitoring and you can arrange for 1 intercourse first, and then arrange for intercourse for consolidation after the ultrasound examination reveals that the follicles are ruptured and expelled, so that you can achieve a high chance of conception.