Late by a week so far very worried!

I had unprotected sex the day after my last period but since then have had protected sex using condoms, had sex at night during the time that I was sposed to have my period this month and had a scare so went and got a plan B the next afternoon & took it. Second time I've taken the plan before, but my period is now 7-8 days late and I'm not able to stop stressing help?!

Side note! I have irregular periods but I haven't gone this long without one, that I can recall not in a long time at least.