A little bleeding during intercourse in the first month of pregnancy is often caused by the following reasons: 1. If cervical cancer screening was not done during preconception, the possibility of cervical cancer must be clinically ruled out, because cervical cancer bleeding during intercourse can occur in its early stages and does not cause pain in the lower abdomen. 2. Because intercourse causes stimulation of uterine contraction after intercourse, resulting in peeling between the gestational sac and the uterine wall, there will be A small amount of bleeding, often accompanied by vague pain or cramping in the lower abdomen. In this case, go to the hospital as soon as possible to do the appropriate examination, ultrasound examination to understand whether the embryo development is still normal, but also to do blood HCG test and progesterone test, according to the results of the clinical then give the antifetal treatment.