abortion or no?

Cy
Writing this is extremely difficult for me. I don't need or want to be told advice on how to protect myself because I know this already. Im looking for some support because I don't know if I want to have an abortion or not. 
I have a 6 year old daughter and 8 month old son(different fathers). I'm a single mom because my last relationship was a domestic abuse relationship. About 1 month ago I started seeing a guy. A few days ago I found out i'm pregnant even after taking the Plan B. The father doesn't want the baby. 
I'm in school full time work part time. Cant afford a car at the moment so life is rather difficult right now. I never believed in abortion i was always pro life, but this pregnancy caught me off guard. I dont know how I would feel knowing I got an abortion...... it would always sit with me. But then its like do i want to bring a life into the world to struggle :-( i have help but not a lot and tat the end of the day my kids are my responsibility so i dont push them on anyone..... i just am so distraught idk what to do