Some women may experience a small amount of vaginal bleeding after intercourse, which is considered to be bleeding from implantation, but it is not a big problem and will be completely clean in 1-2 days. It is not necessary to use medication to treat this symptom. You should pay attention to clean and dry vulva, avoid intercourse and observe the situation. You can also go to the hospital to check the progesterone and HCG level, if the progesterone level is low, you can also consider supplementing progesterone. In addition, folic acid tablets should be used to prevent neural tube abnormalities after the first pregnancy, as well as Elavil, which can supplement the trace elements and folic acid needed for the development of the pregnancy sac.