Scared and want to abort

hi. so I'm pregnant with my 3rd kid. and honestly I am not in a position to be having another kid. I'm by myself. the baby father ditched me and I already take care of two by myself without their father. I'm just really scared. I thought maybe I could give this one up for adoption....but now I'm having second thoughts. I just don't want this child anymore. I don't want to carry it or have it. I love my children and I really wish I was in a better spot right now....and I know that there is a family that would love this child more than I could. but I just can't do it... so can anyone help me? I cannot afford an abortion on my own. I'm barely able to take care of myself and my two kids. I heard that there are some places that will help cover the costs. I'm 12 weeks. I know I got until I'm 20. so please anyone...if you can help I would really appreciate it.