Hi,i felt alittle pain in my right ovary''opk was positive in morning and middle night i had sex.2days latter i saw 2small spot,so which day i ovulate?

Hard to pin down: Because there is more than just one day when you are fertile, largely because sperm can live inside your body for 3-5 days, pinning down the exact moment of ovulation is rarely necessary or important. I would think, of the symptoms you list, the "little pain" was most indicative of ovulation occurring. Many women evaluate their cervical mucus as tool for estimating time of ovulation/being fertile