8 days late, negative tests.

[MissK04]

So as the title says, I'm 8 days late. Completely abnormal for me. However, last month I came on slightly early, 28th instead of the 1st. This month; still nothing! I've always been on the dot. Never late.
I've taken test after test and always negative. I've been undergoing tests over the last couple of months for IBS etc, including an ultrasound scan of my pelvis ovaries kidneys etc to rule anything else out (pains) at the start of this week, where obviously I was told during a "jokey" chat that I definitely had no shock pregnancy so I have no doubts that I'm not pregnant.
So I'm asking if anyone else has had this? Any ideas? I'm due to see my doctor again in two weeks so will discuss then. (She's also done pregnancy tests last week too with me)
Im just so confused, as to emphasise again, this really is not the usual for me at all.
Any advice welcome

...

This happened to me too, last month. It could well just be your body being a bit off - lots of factors can impact on cycle length, like stress.

Mid last year I was convinced I was pregnant. I was 10 days late which is just unheard of for me. I was always between 28-32 days, so I was scared, and tests kept coming back negative. It eventually turned up, but when I spoke to my GP she said it might have been because I had strep throat during the month before and was on penicillin. They said it can throw your whole system out. Has there been anything like that for you?

No nothing different with regards to tablets etc in the last few months stress potentially I guess due to starting a new job next week and my daughter also just starting a new school.. so I'll give it another week perhaps?