Help!!!!

Started birth control in July and took it on and off for a month.. Had sex multiple times during that month and I am now 5 days late. I understand it was a dumb decision to do it, but I need advice. Literally I have taken five 88 cent tests and they have been negative and two clear blue digital tests and both negative.. Could my cycle just be messed up? I didn't take it at the same time every day and missed a few days, but I just don't know.