So I started using OPKS this month and first time I used it after a couple of minutes it was dark, so I posted on here asking if I had already missed it as this was 4 days after AF, but was told was positive, I've still been testing daily and have done one this morning that I came back to a few hours later and is dark (cheap one) so I've done one from boots which is still a cheap one and after maybe 10 mins max the test line is as dark as the control line. So am I ovulating now? Or have I already done it? I'm so confused!! It doesn't help I've just done night shifts so don't know wether i'm coming or going😂