Hi Ladies I have used two different brand OPK's for my last two cycles and managed to get my positive OPK on both. This month I purchased the green handle OPK tests from Early Pregnancy Tests website. I have used it now for 4 days leading up to my ovulation and it shows only the control line. The other brands showed a definite line during that time (even though it was still negative, the line was clearly visible). Has anyone experienced the same issue with these green handle tests?