Sympathy pains/sickness

So I know husbands have sympathy pains/sickness sometimes but has anyone ever experience their children having it? I jut found out yesterday for sure that I am 4 1/2 weeks pregnant. Last week I had been feeling a little nauseous which I didn't experience with my first. My 2 1/2 yo son has been telling the past couple of weeks at random times that he doesn't feel good and that his belly hurt. But he doesn't actually act sick. So just curious if it could be sympathy sickness? I am a stay at home mom so we are pretty close.