Is My Late Period Due To Plan B, Or Should I Take A Pregnancy Test?

I have a question regarding plan b. i had unprotected sex on february 11 and took a plan b like 12 hours after. i got my period 5 days later. then i had protected sex on march 2 and my last period began on march 7. now my period is about 3 days late and i don’t know if it could be because of how plan b can mess up with the menstrual cycle. im not really thinking about being pregnant because i did get my period after the last time i had sex, but either way im kind of scared. should i take a test?