Help please !!!

So I am 7 days late on my period, I had sex with a guy I really like a week ago so last Sunday (nov-11) and we didn’t use protection. The last time I had sex before this new guy was about 2 months ago when me and my ex where together I’ve gotten my period since than but at the time I also took a plan b pill 2 months ago when my ex cummed inside me, like I said I’ve gotten my past 2 periods after I already took the pill but I’ve never been this late before. I’m really scared and don’t know who to tell... please help guys