OPK Question!

So, I know that matching lines means high fertility and to BD right away. But I have taken OPK's that have no line, or vvvvvfl in the past. Today I took one and there was a definite line but still way lighter than the test line. I know it's still negative, but it's still a good indicator that I'm ovulating, right?

Starting TTC next month. Got off the pill several months ago. Trying to learn the best days to BD next month. :) Thanks ladies!