OPK confusion

Gisel
My clear blue digital OPK said I was ovulating on CD 10 and I didn't believe it because I just finished my period two days beforehand. So I  kept testing yesterday CD 15 I got the flashing and today CD 16 I got the soild smiley face. We have been trying for every other day since I finished my period. 
Could this really be ovulation? My temp dropped a little bit yesterday and is back up today. 
Any insight is helpful! Thanks!!