There are the following reasons for sudden bleeding in the second month of pregnancy: in the first case, it may be the occurrence of pre-eclampsia or inevitable miscarriage; in the second case, if you are pregnant again after a caesarean section, it may be the case that the gestational sac is planted in the scar of the uterus and causes the local blood vessels to rupture and bleed; in the third case, when cervical pregnancy or horn pregnancy occurs, etc., the bleeding may also occur. In the second month of pregnancy, fresh blood must go to the hospital for gynecological examination and gynecological ultrasound, pay attention to the cause of the bleeding, and if it is a preterm miscarriage, it can be treated with birth control first. In case of unavoidable miscarriage, the uterus should be cleared as soon as possible, while cervical pregnancy and horn pregnancy need to be given surgical treatment as soon as possible.