Plan B and pregnancies

I had sex on the 16th, it was a Monday. I took a plan b the Wednesday after(19th). I took two pregnancy test this weekend because I noticed my nipples were unusually hurting like real bad, both tests were negatives. I was supposed to get my period today but it’s not there. I have that feeling I usually get when it comes but I’ve been waiting for it all day and nothing.

Should I be worried?

To make it even worse, my mom found the tests and some unused condoms in my drawer. We had « the talk »😫