Period late

So I was told by our dr we had a 5% chance of conceiving naturally per year. So we had random sex once. I wasn’t tracking anymore

And it was around ovulation according to my app. I am 28/35 day cycle length. My period is a day or 2 late. I took clearblue digital test. 3 times. I was a little dehydrated. All came

Back not pregnant. Could I be? Also my stomach has been sick and bloated and feels like

Major gas all night. (I work at night)