Good morning, its so fustrating isnt it??

I had two weeks of what turned out to be implantation bleeding. Like you I thought it was an early and very light AF. It was probably about two weeks after that, that I thought hmmmm something doesnt quite feel right so I tested to rule it out and low and behold we had a BFP.
The dating scan I had a few days later put me at almost 7 weeks.

Luckily I had no inkling that I could be pregnant because I would have been testing every day driving myself crazy. If all else fails a blood test will put your mind at rest one way or the other.
Best of luck