Can I test?

It’s 8 dpo, 5 days past unprotected sex, and I have 5 days until I’m expecting my period but I do have an early tester. I know a lot of times they say wait to check until you miss your period but I took plan b so I’m expecting that it will be a little off. I’m so anxious and can nottttt have a baby so just trying to find out as soon as humanly possible. Thanks y’all in advance