Plan b and early period?

Elisabeth

I had sex with a condom but it broke, almost immediately switched condoms. Was still worried about the possibility of getting pregnant so I took plan b that next morning. Took the plan b about 9 days ago, now I am getting abdominal cramps and some brown discharge similar to what it looks like before I start my period. My period isn’t supposed to start for another 10 days. I know plan b can make periods early or late but wasn’t sure if it could make it 10 days early.