 [ Symptoms ] missed period brown discharge spotting on toilet paper this has never happened before [ Disease ] com this might carry some good news for you it is caused by implantation bleeding which occurs when a fertilized egg attaches itself to the uterine lining usually five to 10 days after conception it is hard at this stage to distinguish whether physical symptoms like bloating breast swelling and acne are caused by pregnancy or premenstrual syndrome are you taking contraceptives