The fetal germ is the stage in the development of the fertilized egg when various organs are gradually taking shape. A fetal germ of 19mm is usually about 8 weeks of gestation. If the pregnant woman usually has a regular menstrual cycle, about 28 to 30 days, then the relationship between the fetal bud and the gestational week can be estimated by the formula, the fetal bud (cm) + 6.5 is the gestational week, so at a fetal bud of 19mm, 1.9 + 6.5 = 8.4, which is almost 8 weeks of pregnancy. The fetus is relatively small at this gestational week, the fetal shape is set, the placenta is beginning to form but not fully developed, the fetus is still in a more dangerous stage, and it is also the time when pre-eclampsia abortion is more frequent. Therefore, pregnant women should pay attention to rest, try to avoid staying up late, overwork, excessive stress, strenuous exercise, etc., and not to have intercourse. If you have any abnormalities such as lower abdominal pain or irregular vaginal bleeding, you should go to the hospital for examination in time to avoid pre-miscarriage.