I'm 38yo. Since early 20s I have been regular as clockwork, every 28-29 days. January period was as normal.
In January I was sick with probable flu (no GP appointments available to comfirm, but I was very sick, had a temperature for 12 days and still have some lingering tiredness).
I get a coldsore each month 3-4 days before my period. That came as normal this month, but 10 days later and no sign of period coming.
Is this illness related? Age related? (No chance of pregnancy, as I've been single and celibate)