Usually, the best time to have an abortion is within 49 days of pregnancy. It takes some time for the gestational sac to develop, and if the sac is too small, it is easy to have an empty or missed suction, causing the abortion to fail or there may be intrauterine residue. This situation may require another abortion, so the timing of the abortion is very important. The size of the gestational sac can be clearly seen by ultrasound at around 49 days of menopause, so this is the best time to choose to have an abortion. In addition, it should be noted that the patient must have a routine examination of vaginal secretions before the abortion procedure to make it clear that there is no inflammation in the vagina before the abortion procedure can be performed. If there is inflammation, priority must be given to treating the inflammation and then performing the procedure after it is cured in order to effectively avoid post-operative uterine infection.