Plan B - bleeding?

I took plan b on Tuesday 21st June after having sex on the Monday evening of the 20th. My period isn't due until the 21st July so I'm getting worried, I didn't have sex when I was fertile as eve would've told me... I was at work today and I've just been to the toilet and I looked at my knickers and there is some blood on there, but when I looked in the toilet my pee was a normal colour not red or anything. I'm scared incase this is implantation bleeding because im not ready to be pregnant. (We used a condom and it didn't split) but I don't know if this is a Levenolle (one step) side effect or what... I'm so worried & scared. Is it normal to bleed after taking plan b or is this a sign that I'm pregnant? Super worried 

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