OPKs and no LH surges

I took opks for two months straight and not once did the tests (2 different kinds) say that I was having LH surges. I got very discouraged and gave up using them. Just bought 2 different kinds again to try again. Has this happened to anyone else? It makes me nervous... Thinking maybe I'm not ovulating properly... Or at all. I have an OB appt but couldn't get in until April. Using the OPKs in the meantime... Fingers crossed 👍