Had my last period on jan 31 .28 day cycle i had sex with my bf on the 5 n 7 and my fertile day is 9th .is there chance i can get pregnant ?

Yes: Ovulation is about 2 weeks before the start of the next period. That means sex at midcycle has the usual chances of pregnancy... around 1 in 4, or 1 in 5. If no normal regular menstrual period comes when it is due, one can do a home urine pregnancy test a week after the period should have started. Test results are very reliable at that time.