2 down 1 for hope

I've had miscarriages and at this point I'm so defeated. Granted they were both unexpected but I've always wanted to be a mama and the fact that I've failed twice now whole I have had friend religiously take plan b and birth control carry to term makes me feel like a complete failure. I try to remain hopeful and keep my head up , however today I finally told my fiance in a game of truth or drink that the last one was him and I didn't have the heart to tell him after not telling a single soul and he is devastated I just dont want to believe I'll never carry to term . I've always wanted to be a mama and everything else I've hoped for has changed but that has remained the same if that's the one thing I cant do i dont know what I'll do.. I'm sure this isnt making any sense but I'm so emotional and tired of feeling like I cant do the one thing I was made for.. all i want is that and I've tried believing it just wasnt the right time but it's hard and my heart aches for it. Please give me hope I'm desperate to believe it just wasnt the right time and that it will happen but I just dont know wether to believe the doctors or hope at this point. Please give me some kind of hope.