Women with regular menstrual cycles, an average of one month to menstruation, in the 45 days of pregnancy HCG values will be in the 50,000IU / ml or so, is normal, during this period to do gynecological ultrasound, the uterine cavity will be seen in the growth of the full gestational sac, the diameter of the 1.5cm or so, there can be a fluctuation in the fetal buds or have an early heart tube beating are normal. As the HCG value changes in a wide range of different women, there is no obvious comparability, need to compare the women themselves, as long as it is doubled every other day to rise very well, there is no lower abdominal pain, vaginal bleeding, you can first temporarily observe. A small number of women have prolonged menstrual cycles, with menstruation every 40 days, and may have a slightly lower range of HCG values on the 45th day of pregnancy. As long as there is no abnormality, it can be temporarily observed, and then retested for the degree of elevated HCG values after 7 days.