At 50 days of pregnancy, the size of the germ is about 2cm by ultrasound, in some cases it will be slightly larger, in some cases it will be slightly smaller, which are all normal phenomena. At this time, if the usual menstrual cycle is 30 days, at 50 days after menopause, you can basically see the fluctuation of the primordial heart tube by ultrasound, which is a normal phenomenon. It is recommended that in the early stages of pregnancy, we must strengthen the nutrition, pay attention to rest, and do not have sex in daily life, because the embryo is still unstable. If you have sex, it will stimulate the uterus to contract, resulting in the peeling of the gestational sac from the uterine wall, which will cause vaginal bleeding and symptoms of preeclampsia. In the clinical situation, if it is not handled carefully, there is a serious possibility of miscarriage.