Plan B confusion, I need help

Celeste • Brooklyn girl, model, athlete, singer, dancer, writer. 23. Virgo. Israeli and Haitian.

So my boyfriend and I had sex Saturday night. He came in me and he never does, so literally within two hours we got a plan b and I took it. But I was supposed to get my period yesterday. However, I know plan b is going to delay my period. I’m not too familiar with plan b and I’m 22 lol... but I’m not too sure what I should expect or what I should know? When should I expect my period? How long should I wait before I begin to worry?