I had a heap of leftover OPKs that expire in September so gave them to a friend last month since I knew there was no way I'd get through them all. I saved a few for myself for this next cycle but gave the instructions to her because I figured I'd remember...I don't... Can somebody remind me how to use them, i.e. what time of day to test, etc.? I think I remember testing around 2pm last time after ensuring it'd been 2hours since I drank, is that right? And I remember that the color of the line has to match the test line to be considered positive. Anything else? Surely it's not rocket science!