Plan B weird side effect's?

took the Plan B pill 12 hours after the condom broke. It happened the day after my period ended. 5 day's later I had brown spotting. It's now the 2nd of December and I'm 5 day's late. I read all the information about the pill before I took it and I can't find out if it makes your period late.... show more took the Plan B pill 12 hours after the condom broke. It happened the day after my period ended. 5 day's later I had brown spotting. It's now the 2nd of December and I'm 5 day's late. I read all the information about the pill before I took it and I can't find out if it makes your period late. The pill doesn't effect an existing pregnancy though..
I took a pregnancy test on the 23rd and it was negative.

Has anyone had this or something similar happen?
Also, I have felt cramps almost every day since I took the pill.
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