Is Seasonique affecting my body already?

Patient: I had unprotected sex on July 4th and at the time was not taking birth control regularly. On the 10th, I noticed Brown and pink discharge, and I have since started taking Seasonique and am exhibiting symptoms of pregnancy which could quite possibly also be side effects of birth control , such as fatigue and frequent urination. I have taken a test but it came back as negative, today begins the second day of my missed period.I have been on the pill for almost two weeks straight.Could the pill be affecting my body already?