Not sure? Help plz

Ok so I’m 16 and have been having sex with my boyfriend recently, we only used protection once (Ik it’s stupid trust me🙄) and now my periods late. It was about 3 weeks ago roughly? That we first did without protection but we did it again the week after, he didn’t pull out any of the times (he’s a teenager aswell and uno shit happens I guess🤦🏽‍♀️) I’m not on the pill and I was ovulating at the time😬what’s the chance I’m pregnant?? Or is my period just late because I’m stressing about it.

Not sure if I’m overthinking it or anything but just need some advice :/

(Also I’m fully aware some people will think I’m too young, stupid etc but I’d rather just have some help xx)