PLEASE HELP ME IM REALLY SCARED

i have had sex with 3 different people this week and i got my period 5 days early but it’s day 1 and i don’t have any cramps and my boobs don’t hurt. do you think i could be pregnant? could it be implantation bleeding? PLEASE RESPOND I NEED HELP!! idk if i actually had my period because i only had 2 days of heavy flow and no cramps at all and my boobs didn’t hurt at all and now it’s the 3rd day and the flow has almost stopped.

what is spotting and implantation bleeding and how do they compare to your typical period? Is there a chance this wasn’t my period and i’m pregnant?

i’m only 16 and idk what to do i’m really scared