Tina - I think they just say wait till AF is due cause by then there would be enough hCG in your system to show on a test. You would very very rarely get a false positive, but you can often get a false negative if you test too early.

So, if you test now and you get a BFP, then you are UTD, but if you get a BFN it either means that you are not UTD or O date may have been later than estimated and you haven't left enough time after implantation to allow the baby hormone to produce enough to show on the stick.. Make sense??

Test for me!!!