welcome to healthcaremagic
Painful ovulation is believed to be caused by a small leakage of blood from the ovary that occurs at the time of ovulation.
It could be cramping caused by implantation
, or it could merely be 'mittelschmerz', which is ovulatory pain caused by the ovarian follicle
stretching or bursting as the egg is released.
If you aren't pregnant already (and want to conceive) take note if you experience this pain midway through your cycle each month