Late periods and stress?

So I'm 23 and I've been getting my period since I was 11. I've never had a regular cycle  per se but my cycle is usually around 35 days, give or take. At the moment, my period is twelve days late, and I can 100% certainly say that I haven't had unprotected sex, but I've had a massively stressful couple of weeks with a few nasty panic attacks, too. Do you think it's worth mentioning to a doctor? I'll probably go eventually to talk about my anxiety but I haven't had a period for almost seven weeks, and for seemingly no reason 😕