On the 35th day of pregnancy, if the ultrasound can see the pregnancy sac in the uterine cavity and the size of the sac is 1cm or more, painless abortion can be performed, otherwise it is prone to leakage of suction. If you want to have a painless abortion on the 35th day of pregnancy, you first need to have an ultrasound examination to observe whether there is a gestational sac in the uterine cavity, and if the gestational sac is more than 1cm in size, you can have a painless abortion. Before the procedure, you need to check whether you have acute vaginitis or other acute diseases, if so, you need to be treated before the painless abortion. Painless abortion generally uses artificial negative pressure to expel the embryonic tissue out of the uterine cavity to terminate the pregnancy. After the painless abortion, you should pay attention to rest, strengthen nutrition, observe the vaginal bleeding and abdominal pain, if there is any abnormality, you need to consult a doctor in time.