hello there.. The clot can be passed depending on its size. \if its huge, it would take time and sometimes they get infected. You have to keep a check that you dont develop fever, with pain abdomen, foul smelling brownish discharge. Incase you have these it suggests infection and you need to start antibiotics followed by sunction evacuation. You can take misoprostol tablet which helps in evacuating small clots after abortion. But before this please consult a gynecologist for an internal examination to rule out infection and to check the cervix. Also she would tell you the appropriate dose as these drugs have to be taken under supervision as risks of heavy bleeding can be there. After the use of misoprostol tabs (generally for 3days) you get a repeat ultrasound after a week. Incase you dont evacuate the clot , its better to get a minor procedure called Sunction evacuation done so as to avoid infection and to send the tissue products for histopthology to know cause of abortion. Also it would help to rule out gestational trophoblastic diseases. Take care.