I need help, I'm scared alone and I don't know what I am doing. What would you do ? I recently found…

I need help, I'm scared alone and I don't know what I am doing. What would you do ? I recently found out I am pregnant after I missed my period, I believe I am 2-3 weeks I will find out for sure tomorrow. I don't know what to do, I made a mistake and slept with the guy I use to date.. I dated him after I had a bf for 4 years. The guy I use to date For a little got back with his girlfriend and I started to talk to my ex again.. Me and the guy I dated after my ex saw each other had a few drinks and slept together... We first had a condom on then after had sex again w/o one, he said he pulled out. (But I am pregnant) After that night I felt horrible about my choice to sleep with him because he has a gf. So I left him alone and didn't want anything to do with him after. I also felt bad because my ex was already trying to talk to me so I decided to give him a chance, we hung out a few days later and made love. Of course it was very different, passionate. We didn't use a condom but he pulled out. Anyways I'm almost 2 weeks late and 3 of the pregnancy tests I took came out positive. I'm scared that I don't even know who the dad is and I really don't know what to do. I'm 19 in college, I have a good job as a waitress and support. But how am I suppose to know what the right decision is when I already made a horrible one. The guy Ive dated wants me to abort , and I have not yet to tell my ex because he would never forgive me if I slept with someone else. And don't know who got me pregnant. What do I do. I've always been against abortions but tmi don't like this situation I am in right now