What shall I do

I am currently 6 weeks pregnant, I was with my ex for 10 years! Have 1 year old little girl. Me and my ex split up officially 4 months ago, but got drunk and slept together just over a month ago (was on the pill). Found out I am pregnant and am absolutely devastated 😫, hes an amazing dad to our 1 year old, but he wasnt a very good partner, he was awful with money, was never around (especially when I needed him) and did a lot of drugs (never around our child). I finally felt free from the relationship and can begin to move on with my life until today 😭😭. My career is just taking off and I'm going to have to stop everything to have another child. The only thing stopping me from having an abortion is my little girl as they will be close in age. I just have no idea what to do?? Any advice? Please dont give me all the info on abortions believe me I know! I've googled the lot and never, ever thought I would be in a situation to have to look them up.