That looks REALLY close to positive! Everyone's positive seems to be different, I've seen some other people who get really dark obvious positives, but mine ended up being just BARELY the same color as the control line. I was using OPK's for 3 months when TTC, the 1st two months the test line was always clearly lighter than the control line so I wasn't ovulating, then the 3rd month the test line finally got to be barely as dark as the control line so I figured that was my positive because I was using 2-3 tests a day just to be sure I didn't miss it and after I got that result the next test the line was back to being lighter...turns out I got pregnant and now have a 3 month old son =)
If it helps, I attached my OPK's from when I conceived, I ovulated really late and it still happened!