Plan B

So I recently took a Plan B pill, just to be safe, even though I had ended my period about 6 days prior to my escapade. Well now, about 6 days after taking the Plan B pill, I am bleeding. It is more than spotting, it is like a regular period but without the thick clotting. I wonder if this has happened to anyone or if it is a normal reaction. It sounded like it was when I googled it!