Clear blue OPKs 2 LH surges

Hello,
I have an average of 28-29 say cycles. This is my second month ttc. 
Using dual hormone clear blue OPKs as well as temping. 
I started OPK testing day 8, as instructed. Day 8 was blank circle, negative. And on day 9 I got a peak solid smiley. I skipped the flashing smileys. I thought this was incredibly strange, as I have no other signs of ovulation. Dry CM etc. Anyway we started having sex every day since the peak smiley just to cover all bases. 
However a few days later I had no increase in temperature to indicate ovulation, so thought would be best to test with OPK again. Day 11: negative blank circle, then day 12, flashing smiley? Day 13: peak smiley.
Very confused. Has Anyone else had this before?? Seems weird!