Struggling with unplanned pregnancy

I am 27 years old and a student. I have a 8 year old from a previous marriage that ended and am now with my current partner 4 1/2 years. We have an 18 month old little girl and we’re not in the best place relationship wise. I’m a student and work part time, he works fulltime and doesn’t earn a lot. We still live well and are in a decent sized townhome in a very nice area. Our children have everything they want and need and more. However I had a miscarriage 5 months ago and now found out I’m pregnant again. I am not ready for another baby but the thought of getting an abortion eats me alive. He insists that we can’t ever get ahead financially and we had a huge blowup over it. He’s not telling me to get an abortion at all, he’s just unhappy with the circumstances. I don’t even know what kind of question this is but has anyone had an abortion even if they didn’t want to? How did that make you feel in the long run?