OPK on Femara HELP

I've started OPKs on cd9. Cd10 it started to get darker and cd11 am I had the darkest line and it's gotten fainter since then. This morning cd12 it was faint too. Is it still too early for me to O? Then why a darker line on am cd11? Was that a positive opk? I have PCOS and never seen a positive opk so I'm not sure. Any insights or opinions on this? Please help I'm freaking out that I will not O or already Oed and it's hard to relax when we BD :( BDed cd 8, 10, 11. Taking a break today and gonna BD cd 13, 14. Help!