Spotting or Period?

Tye
So I took plan B last week on the 8th, a few days later I had some stomach discomfort and even felt some cramps. I talked to a doctor about taking the plan B and she said I should get my period within 7-10days after taking it or when my normal period is supposed to be. This would be the 6th day so idk if this is my period, what do you think?