Paracetamol as in Dolo-650 is the commonly prescribed pain killer / antipyretic prescribed in pregnancy. Studies have shown that there has been no toxicity on the fetus. Hence labelling it safe in pregnancy. Since you have taken this drug only thrice you are not in any danger of any side effects. In pregnancy it is important that you do not over medicate. So take care and avoid all migraine triggers. When necessary you will have medicate as on physician s advice.