Trying to conceive

Brittney
Hello everyone my name is Britney and my husbands name is Kevin we have been trying to conceive since June 2015 and had a miscarriage in August that was 7 weeks old and one the end of December that was 15 weeks old. But still trying to conceive doctors say me and my husband are both healthy and the baby was too, so I'm thinking it might be the babies umbilical cord or maybe the blood going to the umbilical cord might be too thick!?! Do you have any suggestions what we can check or do to prevent from having another miscarriage? Or that we can ask a DR!!