This is my first month using the OPK strips to test ovulation, I've been keeping a "journal" I guess you could call it with the results so far. I know for pregnancy tests after a certain amount of time the results may change, is it the same for the OPK tests? My goal is to be able to really look from month to month and tell exactly when I'm ovulating each month, but obviously that won't work if after a certain amount of time the lines all end up the same color. 🤔