Am I obligated to pray after the miscarriage, or should I wait until purity? And do I have to make up the missed prayers that I did not perform during the bleeding period after the death of the fetus?

If a woman aborts a fetus in which human creation is discernible, then the blood is nifas (post-natal bleeding). Otherwise, it is istihada (irregular bleeding), and she should fast and pray with it. The formation of human features begins after eighty days. Since the fetus died after 66 days, the blood is istihada. As for making up missed prayers, it is more cautious to make them up, but some scholars are of the opinion that making them up is not obligatory if theترك (omission) was due to ignorance.