Someone please help me understand this whole OPK thing. Ok so the past few days I have been getting really dark lines on my OPK but they were still a little bit lighter then the control line so I knew they were negative plus I took a digital clearblue easy ovulation OPK to just to see and it confirmed that it was negative. I just got home from work after having cramps all day and I took another OPK and now instead of there being a dark line there is bearly any line. Could I possibily have ovulated when my test line was darker even though it was a little lighter then the control or what? Could I still ovulate this month even though my test line is bearly showing up now. Please help me out with some answers this whole thing is driving me crazy.