Period 7 days late very anxious

So according to my calendar my period is 7 days late, and I know for a fact that I’m not pregnant. I’ve been pmsing all week like normal, but I’ve also had a cold the past few days as well. Is it normal to miss a period when you have a cold? I’ve counted the days since my last period ended and I’m on day 31, whereas my cycle is normally 23-ish days. Should I be worried about this? I’m still a little sick right now (congestion, coughing) but I’m over the worst of it, so could being sick be a reason for my period to skip? Or is there still a chance it could start again when I recover considering the fact that I’ve had all of the PMS symptoms already despite no period. I know stress can sometimes cause a period to skip and my period not being here is making me incredibly stressed out within itself.