Negative OPK but Fertile Goo

Ni

Hey ladies! I’ve never posted before but I’m completely baffled right now.

I’ve been tracking my ovulation and had “fertile goo” on the 11th. I then ovulated a couple days ago... today, I have “fertile goo”, AGAIN! But I tested and I had a negative opk.

What the heck is going on?! Anyone else have this happen?