Struggling to decide

I've just found out I'm pregnant, and before it had even sunk in I booked an appointment with BPAS for next week to have a medical abortion because it's not the most practical time. I'm just starting university and only living in a one bed house with my partner and we can't afford a bigger place. But I can feel myself getting attached already, part of me wants to wait until I'm far enough along to see my baby on an ultrasound to see how I feel but I know if I want an abortion I should do it sooner rather than later. I feel awful for even being torn at all and I don't know what to do.