Miscarriages and weight.

I had 2 miscarriages and am pregnant again. I am obese and I checked with my ob/gyn whether it's my weight that caused the first 2 miscarriages. She strongly denied and said that it has nothing to do with my weight. This time I did reduce 15 pounds before I got pregnant but still obese.. My husband is not positive and he still thinks it's my weight and I will loose this one too.. I want to stay positive and need my husband to be supportive... I feel guilty for my first two loss..