What are the risks of miscarrying at seven months?

You can't.: The definition of a miscarriage is a pregnancy loss before 20 weeks. At 7 months if the baby were to be born dead it would be a stillbirth, if alive, premature birth. At 28 weeks the chance of survival of the infant is 95%, although it is likely there will be long term complications like eye problems and lung problems. 1st trimester goes from 20% to 5% after heartbeat seen, < 1 % after 1st tm.