The normal size of the gestational sac on day 50 of pregnancy should be between 2.5-3.5 cm, and the fetal bud and heart should be visible at this time. If the usual menstruation is normal and no fetal heart and germ is seen at 50 days of pregnancy, it means that the embryo has stopped developing and an abortion is needed immediately to avoid heavy bleeding or causing infection in the uterine cavity. If the gestational sac is small and no fetal heart or fetal bud is seen in the uterine cavity, it is possible that the ovulation is late due to abnormal menstruation, so you can continue to observe for 1 week.