Cannot do it

When my daughter was 6 months old I became pregnant even though I was on birth control and breastfeeding. I also have 4 step kids making this the 6th child.

I can barely do this now, with 6 kids. My husband works and when he gets home he relaxes because he worked and I cannot expect him to help when he's the only one working.

My daughter is very very high needs... very very. She screams all day, doesn't sleep well. It's simply terrible. I'm 20 weeks pregnant and I don't think I can do this. I don't, I can't. I can't stop crying. I just can't do another kid. I don't know what to do. I can't do this