So random question.....today at work I experienced a sudden onset of what I can only describe as aching muscles around my vaginal opening as well as my labia. I have experienced this pain when I have come close to climaxing but don't and also on the first day of my period. I am currently CD 9 and just had my first showing of EWCM today. Has anyone experienced this and is there any correlation with ovulation? OPK = negative