I want an abortion & feel guilty

I got pregnant by my ex. Feels like the worst mistake I’ve ever made. When we were together, we tried for 4 years and nothing then after we broke up, it was a lot of back and forth but i finally decided I didn’t want a baby anymore. I went through a lot of trauma with him and a few other things led me to the decision but I just decided to focus on myself. I was in the works of moving out of state in 2 months and focusing on building my career. I’m 29 and my career growth means a lot to me. Once i found out, he has been so non chalant. He wasn’t like this before. He said it’s my decision but i knew it was bad when he told me i could still move out of state and he’d just “fly in” if something happened. Like who the hell wants to be alone pregnant? Anyway, i want to do this. I’m super early only 4 weeks but i feel guilty. I told my sister and she’s really religious & basically told me i would go to h3ll and i would regret the decision. I want to enjoy my life without a nonchalant emotionless baby dad, without having to stop what i have going on and i want to have a REAL family and husband. I want my first pregnancy and child to be done the right way. The way i truly envision. What should i do?