SOS pregnant or just crazy

Hi so this morning I threw up 4 or 5 times and had back pain/abdominal pain/ bloating /weakness/ loss of appetite/ and now constipation. I’ve had sex once since my last period, I had protect sex on January 2nd and he did not finish in me. I have him a blow job to finish and he finished in his pants and on my belly. He then fingered me but he says he used the opposite hand from which he touched the cum with. I took a pregnancy test on the 10th (I know too early) and it was negative. I’m currently in the second or third day of my fertile week (just thought I’d throw that in there) and I did babysit a little baby this past Wednesday whose dad had the stomach bug on this past Monday. One of my classmates just recently had the stomach bug and was out for two days. She sits next to me in lunch and in class. I also work at chick fil a and might have contracted something there. Please help