Birth control pills

I was on my 10th day on the pill , and I had unprotected sex this is my first time ever on any birth control besides condoms . I've been with my bf over 4 years now so I desided to get on the pill . I started the pill on a random day just because I didn't get my period all July . But before starting the pill my doc did a pregnancy test and it turn out negative so I started taking the pill on August 6 . And on August 16 I had unprotected sex and I'm scared should I even be worried tho ? When I started taking my pill I would take it between 6-8pm always in between . Never later then 8 or earlier then 6 . But I changed it this past week to 6:30 pm everyday . And I'm just worried I guess I'm over thinking it because it's my first time on birth control and I don't want to fail 😕😕 I'm Taking sprintec