irregular bleeding from plan B + cramps

I took Plan B on January 11th  and should be expecting my next period in 2 days. I had brown fleshy bleeding a week from the 11th and it stopped .. but then started again. I'm worried because when I pee.. there's little floating fleshes and still have brown bleeding and today I started having cramps so I'd it possible it could be just the fact my period is coming or still hormonal bleeding ? I'm panicking!!!