After having sex in the early stages of pregnancy, you should pay attention to observe whether there is any discomfort, and then treat the symptoms. If there is no lower abdominal pain, vaginal bleeding and other conditions of preeclampsia after having sex in early pregnancy, you can observe for the time being and pay attention to proper rest, and not to have sex in the early stages of pregnancy in the future. If a woman experiences mild lower abdominal pain and small amount of vaginal bleeding after sexual intercourse, it indicates that there is a pre-eclampsia, and she needs to go to the hospital for a gynecological ultrasound, blood HCG, and progesterone test. If there is a pre-eclampsia, women should pay attention to appropriate rest, and give progesterone drugs to protect the fetus treatment. If the lower abdominal pain and vaginal bleeding disappear after treatment, and the embryo develops according to the gestational week and the fetal heartbeat is good, the pregnancy can continue.