Please help, I don't know what to think...

I'm not temping anymore, it was getting too stressful. I am recording my CM though & using OPK's.

I've had EWCM since day 9 and did my 1st OPK in the evening of day 10 (today day 12). There was a line, not as dark as the control line, but quite dark. I thought it would be darker the following night (last night) but there was nothing - no line at all! My urine seemed to be much more diluted last night though. We BD'd on day 10 & 12 but I don't know when to think O will be... I know most people say the line has to be as dark as the control line, but after getting no line last night, do I assume that the night before's was + ??? In which case, should we BD again tonight?? I think I'm feeling ovuatlion pains today, so maybe it's today?? Anyone have any ideas????

Thank you for your help.