If your period is missed – which cycle phase follows?

So guys, I've had my period for 10 years and up until now it has come EVERY month and always on time (deviations of 2-3 days are very rare). I had mild whiplash 3 weeks ago which completely threw me off track (2 weeks of dizzy spells, first migraine, panic attacks, extreme tiredness and much more). Now, thank goodness, that's all over, but I've been waiting for my period for a week now (I don't even have PMS and I always have that too, like sore breasts and slight cramping in my lower stomach). I assume that the stress I've had in the last few weeks is the reason for it all. At first I thought I might be pregnant, but I've tested twice now and both times have been clearly negative. My question now (since I've never had a missed period before): what phase of the cycle are you in then? Are you then in the PMS phase, i.e. the luteal phase, the whole time until the NEXT period starts, or is the period phase skipped and you then have the follicular phase, ovulation, etc. again?