Under normal circumstances, a woman can have an abortion at about 40 days of pregnancy, because an ultrasound at about 40 days of pregnancy will be able to visualize the gestational sac, and will be able to determine whether the patient is pregnant within the uterine cavity or outside the uterus. The size of the gestational sac is between 1.0-2.0cm, which can be clearly observed during the abortion and can help determine whether the abortion is successful. Around 40 days of pregnancy, if the patient does not have contraindications to medication abortion, it is recommended that the patient first choose medication abortion, because the harm of medication abortion is the least, and the cost is also the least, if there are contraindications to medication abortion, and then choose artificial abortion surgery. If the patient’s usual menstruation is irregular, the patient’s pregnancy time can not be used as a criterion for whether to do abortion, but the ultrasound suggests that the size of the gestational sac as a criterion for doing abortion, when the ultrasound suggests that the gestational sac is more than 1.0cm, 2.0cm or so, then you can choose medication abortion or artificial abortion according to the situation.