Little anxious & worried🥴

Hi everyone! I’m 25, Ive always thought about having a child, but I’m so confused rn. So I’m currently not on birth control (it’s been 3 years), I tend to have regular to irregular periods. However my cycle is 28 days, recently my bestfriend & I had a heart to heart & things happened, but I’m currently 28 days late on my period. Looking back I was supposedly ovulating during that week I was with him. I’ve taken a pregnancy test (the cheaper one that is for a day after or before missed period) & it was negative. I have another test just in case (clear blue) for 6 days before my next period. I will be taking it next week since that is my expected next period. I’ve been feel nauseous but never throw up, eating more & lost my taste/smell for hot dogs 🥴🤢. Idk what’s going on. Any advice?