Have you done a pregnancy test? I noticed tender breasts before I noticed AF was late - but then I think I was maybe 5w gone at the time. I never had sore or swollen breasts pre-AF before, it wasn't a stabbing pain unless something hit them (like me, trying to work out how tender they were... yes, I know, I'm an eejit). I get the sharp stabbing pains now, but can't remember getting them in pregnancy - so it is normal, I'm sure it is for pregnancy too.

Sorry, not been much help, but I'm another one whose DH noticed her breast growth before she did! Good luck for the HPT.