OPK help please

Lexi
So this is my first month taking Metformin for my PCOS. My last cycle was 90 days long so I've started using OPK'S just in case I'm currently on day 18. If I get a second line does that mean I will ovulate this month? I know a faint line is a negative it has to be as bold as the test line but it does mean I'm ovulating?