Question for ECE's with kids

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So I want to go back to school for ECE (I love working with/teaching children, it's always been my thing), however I'm afraid after a long day of working with children I won't feel like dealing with my own. Does anybody have any of their own experiences? I currently have a two year old and want another one in the future. Also, do you tend to get sick a lot? Were you ever pregnant on the job? Thank you :)