Don't know if I should keep my pregnancy

I’m at lost don’t know what to do I tough about it. I’m mom of 3 kids under 6, 3,2 it’s so hard my health is not that good. I got pregnant it was my fault. I’m not with the father anymore not the same dad of my 3 kids. I don’t think I would be able to do it all alone. I have talk to my family about not wanting to keep my pregnancy and they understand me. What ever I decide they are going to support me. I made my appointment all ready for next Wednesday and Thursday. But I have my doubts with cons and pro. I can’t sleep at night just thinking about it. What if I feel guilty and I won’t we able leave my life with that.