Need advice and encouragement

I just found out today that I’m seven weeks pregnant. I had sex with this guy (my first one night stand), he didn’t put on a condom and he came inside me before I could even say anything, I took plan b but clearly it didn’t work. I actually started birth control right after the incident with the one night stand, but my doctor said that it would probably have no effect on the pregnancy. If I’m being honest I kinda wish it did affect the pregnancy because then I wouldn’t have any trouble getting an abortion. I’ve had a miscarriage and it absolutely broke me so I know I want to keep this pregnancy. I just don’t feel ready and I’m scared shitless atm. I just moved into an apartment, I’m currently getting my drivers license, I’m starting to work again (was on sick leave because of my mental health), so I’m actually starting to get my life together but I’m still really really scared. My parents were very abusive so I’m scared that I’ll be a bad parent like they were. I just need some positive encouragement and maybe some advice on how to get through this alone if any single or separated parents want to comment. The father will be in the picture when the baby is born, but he will definitely not be helping me through this pregnancy. Also want to mention that I’m 19 (turning 20 in December) and I only have my grandparents to support me, no friends or other family members.