Kind of freaked out

Okay, so monday my boyfriend and I wanted to have sex, but we didn’t have a condom. So, we decided, in a hormonal mindset, obviously, that it would be okay for something quick without a condom. When I say it lasted literally fifteen seconds, I mean it. I didn’t think anything of it but the next day I started to notice brown discharge. Fast forward to today. Still dark brown discharge, and no period. My period (I think, i’m terrible at keeping up) is supposed to start in six days. Is dark brown discharge, or spotting before a period normal? Should I be worried about pregnancy? also he didn’t finish in me monday. it was literally in and out