I was supposed to start my period 2 days ago. i have been having clear/white stretchy discharge instead. i ovulated this month. what could this be?

Mucous?: Cervical and vaginal mucous can become very abundant and very stringy/stretchy at certain points of your menstrual cycle. If no irritation, pain or other symptoms I would not be concerned. If worry re pregnancy, then home pregnancy test on first morning urine about 2 weeks after sex, if neg repeat in 7-10 days. If both neg very unlikely you are preg. Hope this helps. Best of luck. Dr. R