Late period going on two weeks

Hey y’all! My last period was November 25. My boyfriend and I had protected sex on December 10 (he put the condom on from the very beginning. when he knew he was about to ejaculate, he pulled out of me even though he was wearing a condom— also, there was some foreplay involved, but nothing where his precum would’ve come in contact with me). My period was supposed to start December 26, but it never showed. I waited a few days and took a pregnancy test, which was negative. Still a week and a half later, I didn’t have my period. So I took another test (actually two) just to calm my nerves. Both were negative. I don’t know what to do because I am obviously still stressed because my period isn’t here. I was wondering if anyone else has been through the same problem?

Background Information:

I had just finished final exams on December 8 (super stressed bc it was my first semester of college). Also, I had some stress from a personal thing when I got home. Following that, I went out of the country for almost a week. I am also slightly over weight. Also, my cycles last any where from 27-35 days. I am now on day 46.

Someone please help me stress less!!