Need help from mothers TMI

I'm a nanny of a 1 and a half year old baby. The first week I worked there we both got sick and I didn't get sick in 5 years until then. Now, the baby had constant diarrhea for about two days and I started to recognize the poop smell. His mom mentioned: "Maybe he has the stomach flu again". I didn't know what to say because I've never seen that. So now I'm cramping badly and I mean, I took plan B on my cycle day 27 (close to period too) so it's probably because of that but, when I went to the bathroom I saw that the poop looked like his, in orange color, and also even smelled like his! Do you think the baby was sick and I also got sick? Thanks for the help