Can ovulation pain happen before or after ovulation? I had a sharp stinging pain in my lower abdomen that lasted maybe 15 seconds this morning out of nowhere. I looked it up in Taking charge or your fertility and it says there is no way to know where that means I have or will ovulate. I took at OPK test and it showed NEG. I should ovulate this weekend sometime because my period started on September 10. What do you think. Also the lymph node on the same side of the pain is tender which that book says is also an indication of ovulation. Have you heard of this before?