The 20 days of pregnancy, that is, more than 20 days after menopause, can not be used medication abortion to terminate pregnancy. During this period of time to check the blood HCG elevation will generally be highly suspected of early pregnancy, the fertilized egg will generally still move in the fallopian tube, has not yet reached the uterine cavity to bed growth and development, do ultrasound examination of the uterine cavity there is no growth of the gestational sac. If you take abortion drugs, the fertilized egg will be killed in the fallopian tube, so the fallopian tube will bleed, and in serious cases, the fallopian tube will rupture and endanger the life of the pregnant woman. If an ectopic pregnancy occurs and the medication is taken, the life of the pregnant woman will also be jeopardized. The medication for medication abortion can be taken only if the pregnancy sac can be observed by ultrasound and the diameter of the sac is less than 2 centimeters, usually about 10 days after the menstrual period has been postponed.