Kristabelle - sounds like you are O'ing now if the line is really dark. Normally with OPK's they say that the test line has to be darker than the control line for a true positive. I was seeing a naturopath when I got pg and she told me not to believe the traditional thinking that everyone O's mid cycle, so keep a closer eye on your symptoms and dont rely too much on dates IYKWIM? If your dp has good swimmers and they have a comfy place to sit and wait for the eggy, you just never know what might happen!

Wishing you all the best of luck,
Lisa