I had sex on the feb 8, 3 days after I felt little sharp left ovary pain, my period are 1 day late, could I be pregnant?

Too Soon. You had sex after the fertile period. It is very unlikely that you are pregnant. It is extremely unlikely to have a fertile egg still available for pregnancy five days before an expected period, especially given that it takes some time for the sperm to swim to the ovary. If you still do not have a period in a few days then it may be time to do a pregnancy test. Five days is too soon.