I had a positive opk on saturday and sunday this week (cd16 & 17). Since then ive had sore boobs and negative opks. Today though I've had low down stabbing pains and a load of EWCM. I thought ovulation was supposed to happen within 48 hours of a positive opk but its been 5 days since my first positive. Plus way to much information but my cervix is higher today then it was at the weekend. Any opinions on when ovulation could have happened? OPKs are proving to cause far too much stress!