You should not have intercourse after a biochemical pregnancy until you have had your first menstrual period. Women can’t have sex too soon after a biochemical pregnancy, they need to have a menstrual period before having sex. After a biochemical pregnancy without menstruation, the endometrium has not yet recovered well, the cervical opening is in an open state, it is easy to cause retrograde infection. The bacteria in the vagina may enter the uterine cavity with the semen after intercourse, which may lead to endometritis, salpingitis, and cause gynecological diseases. In addition, after biochemical pregnancy, pay attention to rest and avoid strenuous exercise. Keep the pubic area hygienic and dry, change and wash the underwear regularly, etc. You can wear some loose, cotton fabric underwear.