Hello, my wife had got pregnant in February and had a miscarriage with both children and we haven't had sex since. On July 5th she went to the doctors and she found out she was pregnant. She said the doctors said it was actually 3 babies and this one wasn't growing in her uterus. She is 16 weeks today so can it be possible that this baby was delayed from the first pregnancy or is this a different pregnancy?

This would be a new pregnancy. It would not be from February.