Zee Pills.

Hello all, so I am currently on the pill (yay) but I am so caught up with work most of the time I forget to take it on time and I take it as soon as I remember could be two hours later or at 4am. Since I have been so irregular with it me and my boyfriend decided to have protected sex to avoid Any oopsies. So guess what? Yeah the condom broke and I ran to Pharmacy to get a plan B pill. Now, here's the catch. My period is 4 days late... It's always irregular but I'm just wondering if it's something I should freak out over or it could be possibly the combination of the two pills messing with my system?