Should I worry?

So on the 20th which was Saturday, I had unprotected sex, the next day(Sunday) I took plan b because I thought I would been pregnant even though my partner came outside of me but I took it so I wouldn’t take any risks, on the 22nd of December I got my period so I thought that on the 22nd of this month I would’ve gotten it but I didn’t, I’m scared and I hear that one symptom of plan b is a delayed period or it comes early and that I should wait one week, it’s been 10 days and on Sunday it should be 2 weeks with no period, this app tells me there’s 7% high of pregnancy. Am I pregnant? I took plan b within 10 hrs of unprotected sex and it’s effective within 3 days. Should I wait longer? I haven’t taken any pt since I want to wait and my period lasts 7 days but should I get a pt now or wait 3 weeks because I checked Plan B’s website but I wanted more advice.