Is being worried worth it?

Alrightty my period is now 5 days late, I had sex the second day I was supposed to get my period but never got it, and I still don't have it, my boyfriend and I are always protected and he checks for any rips or tears on the condom and it stayed together, I don't wanna stress to much about to delay it even more or do u girls think I'm fine and just go with it? I've been excersising throughout the month before I got it, and I had a small cold. So real question should I be worried? Or just let it come when it comes?