OPK - it still correct?

i took a clearblue digital opk and while i was waiting for it i was doing housework and i got distracted and forgot about it for a few minutes. when i went back to it, the screen had cleared so i ejected it and put it back in and it had a flashing high fertility smiley... which it should be or peak, seeing as the past couple of days it's been high. but i was wondering if i can still count it as reliable??