Concern about Plan B. Need Advise!!

I had unprotected sex on may 3rd and I got my period right after (same night & also didn't finish inside). Next morning I took a plan B just to make sure I was on the safe side. My period lasted from May 3rd until May 10th. I've also had no sex since may 3rd. I've also traveled for about 2 weeks in the month of May & did many hikes while in this trip. I don't know if the stress & physical strain from the hikes could've also affected my cycle.

Today is June 10th and I was supposed to have my period on June 3rd but nothing has happened yet. I am worried however about my period being late. Any advice or has anything like this happened to anyone here??