I told myself I wouldn't spend any more money on OPKs... but I have a few sticks leftover from last month (the DIAC ones with the tight cap) that are clearly labeled "do not use 30 days after opening." But maybe it's kind of a soft expiration date, like cereal? Haha cheap-o wants to know, if you ladies have any input!
Re: Do those OPKs *really* expire?