This is my first month trying to use OPK's. I had a positive at 1:00 pm on 3/22 and then at 5:00 pm I took another and it was negative. I figured I would keep using them since I bought a 20 pack and they are only good for 30 days. So Saturday morning (3/26) when I took it, it was positive, and I took nother at 11:00 am that same day and it was positive again. I'm so confused. The positives on 3/26 do make more sense since I had EWCM that day and alsoon Sunday. Anyone have this happen to them??