What should I do? Am I pregnant?

I took a plan B at the end of January was suppose to get my period a week an a half a go but still nothing. Also been having these weird feelings in my stomach/pelvic, dizziness, and headaches but no signs of any period. Took a pregnancy test two weeks after taking the plan B and came back negative. Had unprotected sex around two weeks ago and now that I haven’t gotten my period my tracker is saying that was my ovulation period. What should I do?