Sick Kid?

Does this every happen to you? Your child was sick yesterday and, in the morning, still seems a little under the weather but is much better than the day before. Do you to push your child to go to school or allow him/her to decide what to do?
This probably wouldn't be such a big deal if I were a stay at home mom (or maybe it would, I don't know). But staying home today means I miss another day of work. It's not the money since I have sick leave. It's missing time with my students and teachers. I feel an obligation to both my family and my students.
I don't want my child, who gets sick more often than any of my other kids, to stop listening to his body. I want him to be his own best advocate. But I also don't want him to take advantage of me and my time.
This is one of the hardest things about being a working mom!!