Okay so I started doing opks this month and I started on cd 9 and I'm now on cd 16 I haven't gotten a positive yet but my lines vary in color some are very faint and others are darker (no where near as dark as the control) and each day is different. I though they stayed pretty much the same until you had the surge so is that normal for it to change in color so much...also how many times should I test?? I usually test twice daily once in the morning and once around 7-8 at night....and advice welcome!