Yes Madam, You have been very rightly informed. After the abortion, the uterus contracts to expel all the blood and if any separated tissue is present in the uterine cavity. Improperly contracted uterus will continue to trickle inside the uterine cavity and the collected blood will come out eventually as brown (old) blood. If ultrasonography has shown that the uterine cavity does not contain any tissue or parts of products of conception and contains only some blood clots, they will come out after the medicines given to you for contracting the uterus. Unless the uterus contracts firmly, the bleeding will not stop. Therefore, though these medicines give you pain in abdomen, it is due to the uterus contracting. So please bear the pains but take the medicines to contract the uterus otherwise you will continue to bleed. If the pains are too intolerable, you can take some painkiller like paracetomol or so. I hope this guides you precisely.