A germ of 0.2 centimeters suggests that it is about 40 days of pregnancy, but there can be individual variations. Women of childbearing age who are sexually active and who have an overdue menstrual cycle should suspect pregnancy, which can be confirmed by blood or urine hCG (human chorionic gonadotropin) levels. Ultrasonography should also be performed as prescribed by the doctor to clarify a normal pregnancy. The intrauterine gestational sac can usually be seen at 35 days after menopause, and the fetal buds and the fetal heart can be seen at about 42 days after menopause. When the buds are 0.2cm, the pregnancy is about 40 days old. The blood hCG test can also be used during early pregnancy to see how the embryo is developing. At 6-8 weeks of pregnancy, the value should increase by 66% per day. If the rate of increase is less than 66% in 48 hours, it suggests that the prognosis of the pregnancy is poor, and it is necessary to combine with the size of the embryo suggested by ultrasonography, and follow the doctor’s advice to actively preserve the fetus.