I am hoping someone can talk some sense.... My af was 2 days late last month so on Saturday I did an opk because I wasn't sure whether I would then ovulate 2 days late. I've never had any luck with them before, only ever had a line once and it was feint and that was when I was using them every day. Anyhow this one immediately came out as a v strong line, darker than the control line so I thought I had caught it at the correct moment. For some reason I just decided to do another one and got the same result- v dark line came up at the same time as the control line. It's the same pack as what I previously used so I don't think it's dodgy so now I am a bit concerned there is something wrong?