For those of you who turned out to have a chemical pregnancy or blighted ovum, when did AF turn up?

I had another faint bfp (a little darker though) this morning, but a BFN at the doctor's office (have now had a BT).

And still no sign of AF.
It didn't - I got to what should have been 7 weeks and I'd started to spot and as I said earlier just knew something wasn't right...so I demanded a scan which confirmed it. Then I had a D&C.

Sorry to be so depressing! ... I hope your story has a better ending!