question: 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.