Sick with a baby

I don't know if I even had a virus, because it happened so fast, I ate late the other night, went to sleep. (2 of my kids at a bite or 2 of what I had, I ate alot more.) I woke up about 6 hrs later very hot and nauseous. I was sick about 3 times total the entire time, and diarrhea once. Just a short few hrs I felt alot better and was just tired. By that night I was 100% fine. I'm not sure if I had a contagious virus or maybe a touch of food poisoning but I have a 10 month old and I am scared if it was contagious he could catch it, He went to stay with his dad for the day that I was sick but he had to return to work and brought the baby home. Any advice? What do you guys do to ensure your children don't get sick after you?