How To Confirm Pregnancy?

is vaginal bleeding after having i-pill periods?i n my BF had unprotected sex almost a month back(3-4 days after my periods ended).though he didnt cum inside me,v thought of having i-pill for protection.after5 days i had 3 days vaginal bleeding.my date is delayed almost by a week now.should i wait for it few more days?how much chance of pregnancy is there?please reply.im nervous.