Baby or not?

I’ve very worried. My fiancé took my birth control off ( patch ) during sex yesterday. If I don’t get pregnant I’ll be crushed and if I do I’ll sad. I have borderline personality disorder and it effects me in life a lot. The only people I have in my life are my fiancé, my mom, my grandma, my stepdad, and of course my brothers. I have depression too. I always thought a baby would make me want to get out of bed and give it the best life possible but I see a lot of you guys post about how your baby made it harder. I’ve been told by therapist that I’ll never have a relationship that last. My marriage will end in divorce and my kids won’t have anything to do with me. I was 13 when I decided I wanted a baby. I, of course, didn’t have one or even kiss a boy. I met my fiancé at 15 from across the Walmart parking ( southern love I guess) he was actually with his then girlfriend. We’re older now and I’ve always told him even when we were younger that I wanted a baby but he said no because his brother had two kids with two different people at 17 and his sister also had a kid when she was young. I understood and asked if I could babysit his sisters little boy and I did that for awhile. My fiancé and I broke up for about 9 months and he dated someone else and I just spoke with some guys and ended up dating his brothers best friend (I didn’t know they were friends) he came back and we’re here now. I’m scared I’ll be sad either way.. I need advice. We’re very much in love but I’m scared.