The tests I used when pregnant with Patrick in June had expired in April. Very long story, but a girl had gotten like, 200, on ebay. She sent me 20, so I could test with them to see if they developed evaps since I wasn't actually TTC. I never got a line until I was pregnant, and I DID get a line when I was. So...they're probably okay.
That's how I've been feeling too. Not pregnant here either.