Can a subchorionic hematoma have greater risk with a retroverted uterus?

Usually unrelated. A retroverted uterus shouldn't contribute to a miscarriage and management would be the same, expectant. Good luck with your pregnancy.
No effect. A retroverted uterus is one that's tilted towards your back, rather than your abdomen; it occurs in 20% of women and does not have symptoms, RARELY associated with discomfort. It can't be prevented and there's no need to treat b/c it won't affect your fertility/ability to continue a pregnancy/have a vaginal delivery. It can only be a problem if caused by past surgeries/endometriosis, otherwise OK.