Plan B and Aunt Flo

Brittney • Just trying to enjoy life.
So, I've been freaking out ever since I had unprotected sex with my boyfriend (I know, my fault). But I took Plan B about 36-46 hours after it happened. I didn't really experience any side effects, which surprised me. My only question is: how long could Plan B delay my period? And if you have taken Plan B, how long did it delay yours?