Painless abortion can be done at 4 weeks of pregnancy if the pregnancy is intrauterine and the size of the gestational sac is 1 to 2 centimeters. If the pregnancy is not intrauterine and the gestational sac is too big or too small, or if the pregnant woman suffers from acute inflammation of the reproductive organs, she cannot have a painless abortion. A 4-week pregnant woman can have a painless abortion if the pregnancy is intrauterine and the size of the gestational sac is between 1 and 2 centimeters. If the pregnancy is not intrauterine and the gestational sac is smaller than 1 cm or larger than 2 cm, then painless abortion is not allowed. In addition, if a pregnant woman who is 4 weeks pregnant herself suffers from acute inflammation of the reproductive organs such as vaginitis, pelvic inflammatory disease, cervicitis, etc., she generally can not do painless abortion, so as not to lead to pathogen infection of the uterine cavity and thus aggravate the condition. Therefore, 4 weeks pregnant can do painless abortion, it is recommended that pregnant women go to the hospital in time to check the size of the gestational sac, and follow the doctor’s instructions to take specific measures for abortion. If the patient has vaginitis, pelvic inflammatory disease, cervicitis and other diseases, it is recommended to cure the disease before the operation.