Intercourse is generally prohibited for 1 month after miscarriage. In most cases, the patient’s body has not returned to normal and intercourse at this time may lead to discomfort, infection or even another pregnancy. Therefore, what to do after 20 days of miscarriage depends on the patient’s condition. If the patient has taken contraceptive measures during intercourse, it is recommended to wash the vulva in time after intercourse. If the patient does not have abdominal pain, fever, vaginal bleeding and other uncomfortable symptoms, it can be observed without any treatment. If there are uncomfortable symptoms, it is recommended to seek medical attention and perform ultrasound examination to observe the recovery of the uterus and to examine the discharge to determine whether there is infection. If the patient is not using contraception and needs oral emergency contraceptive pills, the HCG level in the blood can be checked about 1 week after intercourse to rule out the possibility of pregnancy. If the patient becomes pregnant again, without the need for fertility, another abortion may be required, which can aggravate the damage to the uterus and risk lifelong infertility later. If a woman wants to continue the pregnancy, she will need to have regular obstetrical exams to ensure that the fetus is developing properly.