Okay ladies I took a opk and sat it on my counter and forgot about it I believe it sat for an hour. My husband was leaving for a I saw it was positive so I quickly peed to test again and it was Negative.. will a negative opk turn postitve if left on the counter? I'm on cd 15 this is my 4 round of clomid. Can someone explain? The top one is the one that sat for an hour the second one pic was taken withing 10 mins