Is Having Sex While On Brown Pills Of Loestrin Safe?

Hello, my name is Kathy. I am on the first pack of Losterin 24 Fe.(i have never taking birth control pills before) I didnt miss any pills on my first cycle. I finished my 24 day and today started my brown pill. I had unprotected sex right after the brown pill. Am I protected or what should i do? Please help! I need it as soon as possible!!!
Thank you very much! Waiting for your answer!