Late period, Plan B

Condom may have slipped off during sex, I was on the last day of my last period (very very light bleeding) and we decided to take Plan B just in case. My period was supposed to come 4 or 5 days ago and nothing. Took a test last night and came out negative. I don’t think I’m pregnant but want to know if anyone’s gone through this and when your period came back?

I took Plan B once before and it made my period start a week early, lasted 2 weeks and was super heavy a week in. But I haven’t experienced it being late or changed due to PB.

Pls help! Thank you! (Also if you think I should take another test pls let me know, I feel like that’s ruled out since I took one but lmk!)