I need help..

I am going to be 9 weeks tomorrow. I’ve known about this Pregnancy for a while now. I am a 21 yr old college student and i have a 3 yr old already. I still live at home with my mom because she is helping me through school.. this pregnancy wasnt planned and i know i should have been on a birthcontrol method but i just never really got around to it. Anyways, i have a planned abortion scheduled for thursday. And although i been so against having this baby i cant stand thinking that i know its heart is beating and it has little arms and legs and is alive.. but it would be so hard raising another baby alone and also with not the best financial situation. My mom has been so gracious to help me with my 3 yr old and she said she wasnt going to help me again and that I’d need to move out if i keep this baby.. the thought of wanting to know if its a boy or girl or if the baby will look like my daughter or how cute its laugh will be is killing me. My daughter means everything to me and having her at 18 is something I’d never regret. But i feel just so discouraged about this. And i feel so sad and depressed. I need some help