33 yr healthy female.2 cesarean.both healthy daughters. 2 missed abortions,first at week 9,no heartbeat.second at week 12,fetus had heartbeat.reason?

Sorry: for your losses. Hard to say exactly what happened, however, at this point I would seek the help, advice and evaluation of a perinatologist (maternal fetal medicine) specialist to help you conceive again and end with a successful pregnancy. Good Luck to you.

Many possibilities: Making a human being is very complicated. Sometimes something goes wrong. When your body recognizes the problem, you have a miscarriage. One of the most common problems is a genetic abnormality in the growing embryo. Other causes are recreational drug use, toxin exposure, trauma, maternal illness, infection... Since you have had 2 successful pregnancies, your chance of another is excellent!