Opk...

This is my first month using OPKs...lines seem to be identical and haven’t gotten a positive yet. Not sure if I just started testing too late or if I’m not yet ovulating...I’m on CD 18 today. Today’s pm looks darker because it’s fresh but they have all looked exactly like that. AMs are pretty early, 6:30/7ish during the week (CD 13-15), 8:30/9ish AM over the weekend (CD 16-17) and PMS are 5:30-6 been checking cm as well, it’s been creamy/sticky and had thin/watery on cd 16 and 17 and now it’s thickened and sticky again...Thoughts???

Side note: there’s only 1 CD 16(PM) the AM was same I just mixed it up with a bunch of others (I dip 2 tests each time) and threw them all away.