Freaking out

At 6 weeks PP on March 31st I had unprotected sex. (Like a fuckin idiot I had drunk sex with my boyfriend)

I took plan b in the last 12 hours.

My period came the next week.

I took a pregnancy test in May it was negative, then my period came and it was late by almost 2 weeks.

Now here in June my period is 5 days late.

Kinda scared because my older niece is pregnant and didn’t know it because she thought she was having a period and ended up being pregnant, but difference is i don’t think she ever took a test I think she just went in for a check up.

I HAVE NOT had sex since March 31st because I feel dumb for getting drunk and hot and bothered.

Do I need to chill out? Or take another test? Like I’m really freaking out here.