Could I be pregnant?

Patient: I am 17 years old, I have been diagnosed PCOS, I am tired, I am discharging a brownish almost blood. I am craving chocolate, I had sex on July 2, 2015. I am concerned, could I be pregnant?EDIT:My LMP was last week starting on the 7-3-15. It was shorter than the usual 7 day period. It ended on 7-7-15. I had unprotected sex, with no “withdrawl method” on 7-2-15.

Symptoms: Discharging, cravings, tired, breast sensitivity, uncomfortable stomach, shortened period