Quitting my job..

I'm 30 weeks pregnant and I'm currently a nanny to a one year old and two year old (I also bring my one year old to work with me) and I really really want to quit. It's just so hard to chase around all these kids at this point. Not only because I'm so far along, but because I also have severe anemia and migraines that get even worse when I'm pregnant.  (I have a different job that I'm on maternity leave from, I just thought I could do this until I went back- so it's not like I'll be completely out of work)