At 31 days of pregnancy, the normal value of HCG will be around 1050-2800mIU/mL, while the average value will be around 1710mIU/mL. The value of progesterone will be around 25-30mmol/L or even higher than 30mmol/L, which is normal at this time. However, if the HCG value is low at 31 days of pregnancy and the progesterone value is below 25mmol/L, there is a chance of pre-eclampsia, so if possible, take a blood test for HCG every other day to determine if there is a doubling of progesterone. Progesterone can be given orally or by intramuscular injection. However, there are some women who have delayed menstrual cycle and ovulation, which may affect the change of HCG and progesterone value, so we should check every three days as possible to determine the growth rate.