Plan B Paranoia

My boyfriend and I had protected sex on June 25th but the condom broke but he did not finish. Immediately we ran to the nearby pharmacy when we found out and got Plan B. I took it probably an hour after the incident. I wasn't suppose to start till July 16th but I started on July 2nd and I know plan B makes your start day irregular. Maybe I'm just being paranoid but will it make my second period late or should I start soon? I just need some advice or if I should be worried or not?