Unfortunately any answer I give you would only be a guess. I have known women who've been pregnant and bled throughout their entire pregnancy. The only way to know for sure is to take a pregnancy test, use first morning urine, or go to the doctor for a blood test. Either way you should see your doctor if you are concerned about this bleeding, and if you are pregnant then your doctor should be informed about your bleeding as well.
Sorry, we can't give you a diagnosis over the internet, best bet is a doctor.
Take care. :)