Where's my ewcm??

Today I'm on cd15, ov should be tomorrow but I have a bad feeling its going to be delayed. So far this cycle I haven't had any ewcm (the most fertile type of cm) when we started trying a year ago I would have a weeks worth of it so where did it go?? I'm hoping its just hiding away behind my cervix waiting for the spermies but what if its not? Needless to say I will be being liberal with the preseed over the next few days! I did get another 'high' reading on the opks this morning but the lines seem to be getting fainter not stronger, guess we will have to wait and see what the next few days bring