Ok so I know that if the line on your OPK is faint, then it is negative, but mine is slowly getting darker, is that how it normally works? I started with the OPK the day after AF ended and got a barely visible line (I had to move it in certain lights to see it) each day since then it has gotten darker and darker but is still not quite as dark as the control line. I just wonder if this is how they normally work and I am not sure I will ever know if it is positive or not. I don't expect ovulation for 3-5 more days will the line start getting lighter and lighter after O? Am I the only one that wishes the OPK would just say OVULATING or NOPE NOT YET????