Hello, I recently stopped taking birth contol at the beginning of August. I had a regular period on August 9. Then, on September 12 and 13 I spotted. It was just brownish blood with a light red blood once. I have had horrible headaches, horrible back pain, i'm nauseous, extremely tired, my breasts are very sore. I have taken several pregancy tests and all were negative. Can this just be my body adjusting to me getting off birth control?