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A missed abortion (MA) is a contraindicated pregnancy, in which the body has not yet rejected the fetus.

If there is a missed abortion, then during the ultrasound of the fetus it is shown that the heart is not beating. The reason to why the body doesn’t reject the fetus, is because the placenta will still be able to produce the pregnancy hormones, so that body is thinking that it is still pregnant. The woman will therefore still be able to test positive and have normal pregnancy symptoms. But after a certain amount of time, the placenta will not be able to maintain the normal homronal production flow, and the body will then either start a spontaneous abortion by itself, or one will be diagnosed and sent to the hospital and get a curettage.