Not flu, but I did have food poisoning once when I was pregnant. I threw up for almost an entire day, ended up in the emergency room. They had to put 3 bags of fluid in me in the first hour or something I was THAT dehydrated and then several drugs to keep me from vomiting. It was a horrible experience, all that to say....baby was just fine. ;o) I am sure you little peanut is okay. Please try to relax, get some rest and get over it quickly.