I’m on Cycle Day 7, and I’ve never used OPKs before but after two months trying without them wanted to start testing. My cycles are 28 days, 4 days of AF. Based on that, I was told to start testing around CD10. But what do I do from there? I know it’s only positive if the test line is as dark as the control, but that’s all I know about them! How do I know when to BD based on them? Is a positive that I’m ovulating now or will be ovulating soon? Any advice is beyond appreciated!