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Yes spontaneous abortion
may be over in a couple of hours, provided there is no retained products of conception.
Did you get an ultrasound
study done before this bleeding?
Only method of being 100 % sure that you are pregnant and to know the duration of pregnancy
, is by doing an ultrasound study.
To be doubly sure that abortion has occurred and that there is no retained products of conception, again ultrasound is the method of choice.