The specific HCG in the fifth week of pregnancy will generally be in the range of 2000 IU/L, but the HCG data will vary considerably between individuals of the same pregnancy time, between 500 and 10000 IU/L is normal. The time of pregnancy is counted from the first day of the last menstrual period. If there is no abdominal pain and no vaginal bleeding, it is not necessary to routinely do HCG and progesterone test. Ultrasound examination can be done around 50 days of pregnancy to clarify the gestational week and understand the development of embryo, to exclude ectopic pregnancy and gravidity, and to find out whether there are twin pregnancies and pelvic masses through ultrasound examination. If you have a history of ectopic pregnancy or if you have abdominal pain or vaginal bleeding in this pregnancy, you should consider the possibility of preterm miscarriage or ectopic pregnancy, and you should pay attention to checking progesterone, blood HCG and ultrasound to make a clear diagnosis, and if necessary, to determine by dynamic review.