I was having sex and realized couple day after that i was taking the other birth control that was old and was no longer prescribed to me will that cause me get pregnant?

"Old" or "expired" medications may not be effective. If oral bcp's are started during the first couple days of a normal period, and taken punctually, they are very effective ( greater than 97%) as contraceptives. Get a new prescription from your gyn provider and if symptoms (breast tenderness, water retention, etc.) occur, obtain a serum HCG test to be certain about pregnancy.