You know I just literally bought a pack today... a little annoyed because the only one my store had was a darn 20 pack... is that extensive or what? wouldn't be so bad, but apparently once you open the tube they're only good for 30 days. Argh
No positive yet, but from what I read if you go for it the day you get a postive, the day after and if you feel like it the day after that you've got a pretty good shot! We'll see...