I’m confused and need help

Ok so this is my first month on birthcontrol and it’s pretty low dose of hormones so people recommend that you wait the whole month before having unprotected sex. My boyfriend and I were having sex and the condom broke, I looked into it and with the bc I’m on it was ok to take plan b so I did. Today is the day my period is supposed to start (it hasn’t yet) should I be worried or is my period gonna be late cus of the plan b?

Update: got my period! Gonna leave this up for anyone that might be in a similar situation. Thank you for the responses!