<s>[INST] ive been on loestrin24 for 2 months & it adjusted to my body pretty quickly. also i am a PERFECT user, i take it at the EXACT same time every day. in the begining of my second pack i started taking clarithromycin, but continued to take my BCP. 4 days after i was done the antibiotic i had unprotected sex, but he used the withdraw method. what are my chances of being pregnant. [/INST] Hi there, It is great that you have been taking your Birth control pill regularly. And even if you took Azithromycin, it is very effective in birth control, that is you will not get pregnant even though you did not use back up. There is a misconception that taking antibiotics makes birth control less effective, but this depends on the antibiotic, Azithromycin is not an enzyme inducer, that means it will not affect the ability of the birth control even if taken together with birth control. So there is no chance that you could get pregnant. Do not worry and continue the Holstein. Hope this helps. Regards. </s>