Hi, this is my first month charting, i'm using OPK's but not taking my temp. On CD15 I had sore bb's and a few twinges which hinted at Ovulation approaching, MY opk was negative that day, then on CD16 I got a positive (as dark as the control line), On CD17 I got another positive (much darker than the control line) then on CD 18 and 19 i've had positives the same as CD16. I thought this was normal until I started looking through galleries of OPK's and noticed that most women only got 2 days of positives. All 4 have definitely been positive. I test at 11am every day as this is most convenient for me, usually with 2mu. Is this normal? Can anyone help? Thanks.