Okay so I was supposed to start my period on Sunday and it’s now Thursday and I haven’t started yet. I am on TriLo Marza BC and should be starting my new pack Saturday. I’ve taken two tests and they have been negative. I took one before I was due and one on Tuesday. I’m only worried because the week I was ovulating I have been put onto three types of antibiotics and they didn’t remind me or tell me that it would make my Birth Control ineffective. What should I do? Start my BC when I am supposed to or wait until my period comes/I have a positive test?