I have been taking my birth control pills (Cyred) regularly for about 4 years. No missed pills, not late pills, I take them at the same time every single day. I was prescribed Ciproflaxacin for a UTI 3 days ago. I started taking the antibiotic the evening I was prescribed it, and had sex without a condom the following evening. I have heard mixed reviews about certain antibiotics decreasing the effectiveness of hormonal birth control, so just to be safe I took a Plan B about 2 hours after having sex. I went ahead and took my birth control as normal the following morning as well as my antibiotic. Should I be concerned about my birth control not being as effective? Or am I just being paranoid?