Worried for no reason ??

Hey so me and this guy hooked up we messed with each other's stuff made out etc.. no sex though, he didn't cum or pre cum but I was still worried that Somthing could happen.. I've been asking a lot of my friends to see what they thought and they said it's nothing to worrie about and I will be fine That theres a very very small chance of getting pregnant but today I started my period, normally though I start with a medium amount of blood but today I woke up just bleeding a little I normally end with a light period so I wanted to see if this something I should worrie about or not... ( sorry for the detail I thought I was just necessary, to see where in coming from lol )