What do I do about work???

I am a first time mum this is my first pregnancy but feel so overwhelmed at work I'm a early childhood educator and work long days with only a half hour lunch break I'm coming home exhausted and emotional and swollen, back so sore I can hardly stand up, I'm only 16 weeks I've cut back my days with not much help, I'm at the point where I want to leave. What do I do?