Help??

Cheyennea

I am on birth control pills and me and my husband had sex march 13th I recently got on antibiotics march 14th And I heard sperm lives in you 3 to 5 days and antibiotics decrease birth control affectivness. Plus thats when id be ovulating but I know you can't on the pill. What's the chances Im pregnant and how soon can I test? I expect my period the 30th. Thank you!