What would you do?

I'm 24 weeks pregnant. I have two boys ages 3 and 1 1/2. I babysit two boys for two of my friends but, I don't want to anymore. I'm tired, I'm sore and everyday I have to babysit I just get stressed out. I watch one in the afternoon and the other overnight until noon the next day so I really don't get time with just my own kids. How can i tell them I dont want to watch them anymore? They really don't have anyone else to watch them. I just feel like I have to because I'm a stay at home mom. How would you tell them?

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