Im On Tri Sprintec Birth Control. I Usually Always Tame

Im on tri sprintec Birth control. I usually always tame it every day at 7:15 am. I currently used unprotected sex. How many can I take to substitute as plan b? How effective do you think it will be? And how exactly do you recommend I do it? I can't go get a plan b pull myself. So this is my only option.