Hi. I started using this OPK on CD 11. the first 3 days there was only the control line that showed up..then after that i started getting faint lines that got darker each day..CD17 and 18 i got 'almost' Pos. results but not quite, then the next 2 days they went back to a barely there line, now Sat. CD21 i got a Def. Pos...can anyone explain why i got almost Pos.'s then 2 more barely there lines and then a bright Pos.? I have Answer OPK 20 test strips..says you can test anytime of day. Today was the first i tested a diff. time..in the morning..the other days i tested 5pm and some days i took 2 tests 5pm and 7pm....i have no idea with the way my results been this past week and today 'when' or 'if' i O'd yet....i had O-pains from CD 17 and 18..19 i had only soreboobs and headaches and around 9pm on CD 20 i started having o-pains again and since i woke up today (CD21) still having o-pains,soreboobs and headaches, i even got a twinge of pain in my L boob and L boob has more ache in it then the R boob......help im confused