Anyone else have reoccurring miscarriages?

First of all... I am 21 and my DH is 22. We first got pregnant (not TTC) in September of last year and lost the baby in October. We were obviously devastated and decided we would TTC. We fell pregnant, again, in June. My doctor called me in as soon as I gave him the news at 5 weeks. Unfortunately, my progesterone level was a 10.2 and he wanted it over a 12. I was prescribed Progesterone caps but lost the baby the next week. I just want to know what the problem is.

The only medical issue I can think of was a B12 deficiency a few years ago. I had to get supplement shots every month but never kept up with that. Other than that I am "healthy" but admit that my eating habits aren't that great. I don't eat fruit or veggies... I had been taking Folic Acid and prenatal vitamins prior to the second mc.

I never knew this would happen to me. I'm fairly young, I know, but it is such a horrible feeling not knowing if I'll ever have children.

Any advice?