2 miscarriages 3 months apart... will I ever have a healthy pregnancy???

Mercedes

Hi I'm 27 years old and last year I had 2 miscarriages 3 months apart and than after that I feel like now I can't get pregnant. me and my fiancee haven't used a condom and I'm not on bc. I'm trying for baby #2. My daughter is 5 and she has been asking for a baby brother. what can I do to get myself good to get pregnant? p.s. I did gain 40 pounds from stress