Can I take a test yet?

Af is suppose to show in 8 days. However , I’m currently bleeding lightly right now.

Period calculator apps have told me that I should be able to test today or tomorrow. Does that seem realistic ?

Really need to find out what’s going on. And I’m honestly starting to get super scared.

Just wanted to know IF I’m pregnant do you think I could get a positive if I took a test today or tomorrow ?