Bleeding a week later after plan b

So I took plan b August 6th at 12:00 p.m. August 10th and 11th I had some cramps. The following day I went to the rest room and when I wiped I saw discarded blood. I wiped again and saw less discarded blood and a spot of fresh blood. I was bleeding for 6 days. I should be on my period right now but I am not. Does this mean the mixture of discarded blood and some fresh blood mean I had my period?