Fetal heart disappearing again in the second month of pregnancy may be caused by delayed conception or cessation of embryonic development. 1. Delayed conception: If some pregnant women have irregular menstruation, it is possible that the time of conception is delayed, and the development of the embryo will also be delayed, so in the second month of pregnancy, the fetal heart is not yet seen, you need to go to the hospital regularly for pregnancy tests. 2. The embryo stops developing: It may also be because the embryo has stopped growing, and the levels of estrogen, progesterone, and human chorionic gonadotropin in the body have decreased, which results in the disappearance of the fetal heart, which should be well examined, checking the chromosomes of the fetus, the blood type, as well as paying attention to the quality of the parent’s sperm, in order to prevent the fetal heart from stopping again. If the fetal heart disappears again in the second month of pregnancy, you need to go to a regular hospital for further examination to avoid delay.