I had unprotected sex Nov 7th and dec 13th...I.got tested Jan 12th and everything was negative...but later in Jan I got sick with the stomach flu that lasted a day and after that everything was fine. In march the same stomach bug came back only last a day and I was fine. today the same stomach bug came back and once I vomited and passed stool..I'm fine. it'll starts with smelly burps ...like acid reflux and then wind up I vomit. I. got tested 8-9 weeks after my first unprotected encounter...and it was negative...the second encounter was maybe 3-4 weeks in when I got tested...could it be that the second encounter is what's causing these stomach bugs?? Could I be infected? I'm going to get tested friday again