Pos OPK early? Help!

I'm 27yr old trying to conceive our first. My hubby and I have been trying since July. I have been using OPKs since then. I ovulate on CD 14 or 15 every single month. This month I took my first opk for the month on CD 11 and its positive?! Why would I be ovulating so early?! My hubby and I thought I just entered my fertile window and now I think we missed it. We baby danced last night and because of work we won't be able to until tomorrow afternoon.

Any advice on why it's already positive?! Help!