Missed new pack of pills

I finished my last pack of pills last Sunday and yesterday I was finally able to get my new pack from my dr cause they forgot to call me. Anyway I didn’t have sex in those days of not taking birth control. I did today though and it’s my second day on my pills for the new pack and we had unprotected sex and he ejaculated inside me. I’m worried now that I may become pregnant. What are your thoughts on it since I was off the pills for four days??