3 days after i had sex and my boyfriend came

Patient: 3 days after i had sex and my boyfriend came in me. alot of blood came out of y vaginal area with lots of mucus. i started bleeding pink and brown. but this lasted for 12 days. now its not as bad but its the 15th day and im still spotting. am i going through implantation? am i pregnant?? ps! this has never happened before

Symptoms: Bleeding, spotting (brown and pink), pinching feeling in lower abdomen

Doctor: