Any one ever have ovulation tests that say do not use after 30 days of opening?

Ashley • Finally going to be a mommy
I bought some opks a while back and never used them all but now since I'm using meds to ovulate I wasn't using them. We are taking a break from fertility treatments because my doctor pretty much told me I was wasting my time :( are they really no longer good I don't want to throw them out if they can be used please help :) thank you