Depression with failure to conceive!

Heather • Single mom raising 3 kids here. My bf now has 2. My kids dad isn`t in the picture. My bf and I love them all
I've been getting very depressed with not being able to get pregnant. Wondering what's wrong with me. If his druggie bby mas could get pregnant why can't i. I cry every time I get my period. I'm starting to get very jealous of other pregnant people.