Hello, I had a sinus infection & the doctor prescribed me Azithromycin on 10/13/12 & I finished them on 10/17/12. I also started my cycle on 10/17/12 & it ended 10/21/12. I also take birth control pills(Sprintec) everyday & haven't missed a day & my husband & I use condoms. However today 10/22/12 my husband & I had intercouse & the condom broke! Am I at risk of being pregnant & how long does the antibiotic make my birth control ineffective? Please help!