Hello, My Last Period That I Cab Recall Was June

Hello, my last period that i cab recall was june 11 the one after that was july 12 and my expected date for August is also around that time. Except that i am currently bleeding and have no answer as to why. Todays date is July 30th 2015. The bleeding started earlier this morning with no pain or cramps. I have taken a plan B pill about 2 almost 3 weeks ago. Any information is valued, thank you.