It is very sad that you lost your caesarean baby. Heavy bleeding with a low positioned sac does not indicate a good prognosis. Fetal heart will be seen at around 7 weeks in a trans-vaginal scan. Since the bleeding has subsided what we can do is to wait until the next scan to decide what can be done. Meanwhile take absolute bed rest
, avoid intercourse and stress
. Many-a-time, though, such pregnancies continue without any problem later on. You may ask your gynecologist if any hormone supplementation can be given. Wish you good luck.