How many days your period was late after taking plan B?

Hi! I'm 2 days late on my period, I did take plan B nearly 3 weeks ago, (2 days before supposed ovulation my cycles are very regular) my period now is late, which is expected but it still makes me worry alot. I did a test today which seems to be negative. Did you have late period after taking plan B in the middle of the cycle? If yes, then how many day? Did you end up pregnant with having a late period? Thank you!

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