Chart interpretation

I don't get much EWCM so rely on BBT and th OPK to tell when I'm ovulating. I always get a temperature dip, which I got this time as well, but the positive OPK only came couple of days later. How can this be? And when you do think I ovulated?

Also, I'm a bit concerned my temps don't shoot up immediately, and tend to have a 2-3 day lag. What does this mean and is it cause for concern? Is my progesterone inadequate?

Thanks a lot!