You can’t have a medical abortion if you can’t see the pregnancy sac on the ultrasound. You can choose medical abortion to terminate pregnancy only if the pregnancy is less than 49 days old and is intrauterine. If the ultrasound can not see the gestational sac in the uterine cavity, the gestational sac may be too small, or the gestational sac is not in the uterine cavity, such as the gestational sac in the ovaries, abdominal cavity or fallopian tubes, belonging to the ectopic pregnancy, that is, ectopic pregnancy, you must further abdominal ultrasound examination, to rule out ectopic pregnancy, before you can have a medical abortion. If the ultrasound can not see the gestational sac, it is likely to be ectopic pregnancy, once the implementation of medical abortion, not only the abortion will fail, but also may cause hemorrhage, very dangerous. Therefore, ectopic pregnancy is not allowed to have a medical abortion. If the examination is clear for ectopic pregnancy, it is recommended to cooperate with a professional doctor as soon as possible to carry out laparoscopic surgery to terminate the pregnancy immediately. Even if the examination is clear for intrauterine pregnancy, we have to further observe the position of the gestational sac and adopt the opinion of professional obstetricians and gynecologists to determine whether it is possible to have a medical abortion.