I have not had a period since03/06/12. I started back exercising and have not lost but gained weight. I take more naps then usual and have sharp breast pain that make my nipples ache. @ days ago I began seeing this brown discharge with a piece of skin in when I wipe( No Pain). For the two days I saw it only 3 times. So far today I only saw it one time this morning around 715 a.m. I have not seen anything else. I have taken a pregnancy test and both test came back invalid. I feel like I am pregnant, because I know my body, but I have made an appointment to see doctor in two weeks. Can you tell me advice on what to do.