Had sex without condom on monday i am on birth control pills take them perfectly . was prescribed antibiotics for uti today(wednesday) is it safe to take them or is there a risk of pregnancy from monday with the antibiotics and birth control pills?

BCP ?'s: Although there are specific antibiotics which can diminish the effectiveness of oral bcp's, if there is no withdrawal bleeding during the active pill series, it is unlikely that protection from pregnancy will be affected. Competitive absorption of oral bcp's from antibiotics would possibly diminish the active pills presence in the blood stream, so no withdrawal bleeding indicates effectiveness.