I had sex with my boyfriend 3 days before my ovulation day. After my ovulation day I had pink & brown spotting within the whole day with cramps.

Pregnancy test. It is possible you could be pregnant. Go ahead and take a pregnancy test and if positive, see your Ob Gyn ASAP as any bleeding in pregnancy needs to be evaluated. If negative, you should still see your doctor, as your symptoms could indicate a vaginal infection or an abnormality in your menstrual cycle.