I am on day 16 and still not got a positive OPK. I had stringy CM yesterday, and a little bit of pain the past few days. But still nothing! I have been using 2 cheapie OPKS and 1 digital one per day and I am not even getting faint lines? there is nothing on them at all apart from the control lines. its driving me bonkers. Just really wanna see a line! we are still following SMEP and BD'ing every other day just in case. Thankfully I have a CBFM to start using next cycle so i dont drive myself completely crackers with POS can you ovulate this late with a 31-33 day cycle? even my chart on my signature is wrong as I cant of ovulated if I have not had a LH surge can I?