One month pregnant can not do abortion, because the general number of days of pregnancy is calculated from the first day of the woman’s last menstrual period the number of days of menopause, if the number of days counted from the first day of menstruation is more than 30 days, the gestational sac may not have completely grown out, and the yolk sac can not be seen under the ultrasound. In this case, usually can not do abortion, because the number of days is too short, just see a liquid dark, did not see the yolk sac, in the case of blind surgery is easy to miss suction, easy to lead to the complications of the second surgery. It is best to stop menstruation for more than 42 days, go to a regular hospital to do ultrasound examination, ultrasound shows see the yolk sac, see the complete gestational sac, and then carry out abortion surgery, drug abortion surgery. Do abortion to terminate pregnancy, must ultrasound to see the yolk sac. If a woman’s menstruation is very irregular and often delayed, she may have to have her first ultrasound to see the yolk sac before she can have an abortion.