Sorry - posted in the conception thread and no advice.
My period is now 11 days late (!) when it is normally extremely regular and even when a day or two late with the full flow I've had spotting/traces of blood. This month I got the usual PMS-y build-up, but not even a hint of a period. 2 pregnancy tests (one at 7 days late and one at 10 days late) have been negative so far.
Have I been testing too early? Is this normal/possible? My period has never been anywhere near this late before! I also am aware that stress can play a part, but i work a stressful job and have never been more than two days late, hence the worry! My period is usually ridiculously reliable.