I had sex a few days before my anticipated period date which was only an estimate but only usually varies by a few days. However it has not arrived and is now 7 days late. I know technically this should pretty much be impossible, I'm 38 and know how cycles work. However I'm also aware that the boxy can be a very odd thing! Has this happened to anyone? Any input would be greatly appreciated! I know the obvious answer would be to take a test but if I did conceive then it is still unlikely to show up on a test.