You can’t have intercourse after 20 days of medical abortion because it can damage your body and uterus. 20 days or so after medical abortion, some people may have normal ovulation and intercourse at this time may cause unwanted pregnancy and continuous unwanted abortion can cause serious damage to the uterus. If you have intercourse within one month, it may cause bacterial infection and inflammation of the endometrium, which may cause uterine adhesions and blockage of the fallopian tubes in serious cases, chronic pelvic pain and chronic pelvic inflammatory disease, which will have an impact on future pregnancy and menstruation.