Continue work or quit

I'm 28 weeks pregnant now and the pregnancy is going great besides me being stressed out. I am a nanny and I watch 3 kids everyday. 2 nine month olds and a 3 year old. The babies cry all day long. The three year old swears a lot and is always trying to act out so I'll call his mom to come home. I feel very stressed everyday when I'm there. And it's making me feel so bad because I'm getting so irritated and angry at all of the kids. I know babies cry and kids will be kids but its constant and I can't catch a break. My boyfriend is looking for a job right now but is currently not working. So I am the only one making money right now but I'm not sure if it is worth me feeling this stressed out everyday. What are some of your opinions?