Local cleansing is recommended after half an hour after intercourse during pregnancy preparation, but all avoid internal vaginal douching, mainly to avoid bringing outside pathogenic bacteria into the vagina. The main purpose of this is to avoid the introduction of external pathogenic bacteria into the vagina and to avoid douching out the semen, thus reducing the probability of pregnancy. After having sex during pregnancy, you need to lie down as much as possible for a period of time to promote the upward movement of semen, thus increasing the probability of pregnancy. During pregnancy preparation, pay attention to good rest, ensure the quality of sleep, pay attention to adequate nutritional intake, and avoid exposure to toxic and harmful substances to prevent the quality of fertilized eggs from being affected. Both spouses need to quit smoking and drinking and take folic acid on time to achieve scientific pregnancy and eugenics. You can choose to have sex during ovulation and 1-2 days before and after ovulation to increase the probability of conception.