Considering abortion

Hello! I just found out that I am about 4 weeks pregnant. I currently have a 5 month old and a two year old. My fiancé works about about 100 hours a week and I work full time and go to college and have my children whenever I’m not at work. I’m am also on a progesterone shot to help with my postpartum depression. I honestly think I can’t care for another baby. I am pretty stressed with the two I have and while my fiancé works for all the things we have he’s never home to help. I haven’t told him yet and idk if I am especially if I decide on abortion. Am I wrong? Should I do it?