How to reduce the dosage when using progesterone for birth control depends on the ultrasound examination, including the value of progesterone for detailed judgment. If the progesterone level has returned to normal during the period of fetal preservation, you can change from 2 times/day progesterone to 1 time/day progesterone and stop taking the drug after 2-3 days of oral intake. Be sure to make a detailed judgment based on your own progesterone value, to avoid blindly stopping the medication quickly on your own, but more likely to cause bleeding or the chance of pre-eclampsia to occur. In this case, it is better to stop the medication gradually according to the doctor’s prescription, and it is not recommended to stop the medication blindly. At the same time, it is important to ensure the stability and health of the fetus during the period of fetal preservation, so as to avoid the continuous loss of progesterone, which may lead to miscarriage. Discontinuation of the medication should be based on whether there is a certain accumulation of blood and fluid around the gestational sac.