Lots of positive OPK’s?

So I started using opk strips since Thursday and had a negative result up until Sunday morning. Then it turned negative Monday, then I got a SUPER strong positive again this morning!

I should also mention I took Plan B Sunday afternoon after an incident Saturday morning. I know, I was cutting it really close. So my question is, has anyone else had opk’s that fluctuate? I’ve had many days of positives before, but they were all very positive. It seems like it’s going back and forth now. If anyone has any insight, please share!