Hello, Loprin or low dose aspirin is usually prescribed when blood clotting is considered to cause abortion. If you have a history of abortions, your doctor could be trying to take care of multiple possible causes at the time. Loprin in itself does not cause an abortion. If a missed pregnancy is diagnosed, it is done after two repeatedly negative sonograms and a falling serum beta-hCG titres. In such an instance, external progesterones and aspirin should be stopped to facilitate spontaneous expulsion of the dead fetus. Hope your query has been answered.