OPK question!

J
This is my first month using OPK's and doing the SMEP. All my OPK's had faint lines on them up until CD14 (6/17) but that one wasn't a super strong positive, then on CD15 (6/18) I got what I believe to be my surge. Then today, CD16 (6/19) I tested once more and my line was faint again. Does this mean that I ovulated today, or is there no way of knowing?
CD14:
CD15:
I didn't take a picture of my test today, but it was lighter then the ones above.