It is recommended to wash with warm water 30 minutes after the sperm is ejaculated during pregnancy preparation, because if the sperm stays in the vagina for a while longer, it will increase the chances, but it also varies from person to person. During the preparation period, you should go to the hospital regularly to monitor your follicles with ultrasound to see if there are normal mature follicles and if there are normal follicles discharged. During the preparation period, women should calculate their ovulation period in advance and seize the right time to have intercourse in order to ensure the combination of sperm and eggs to get pregnant. It is recommended that after sex, you should lie on your back for about half an hour to an hour and wash your vagina with warm water to avoid the outflow of semen, which is relatively safe and easy to get pregnant.