I have yet to get my period. The last time I had it was March 17th. A few days after I did have sex, we used a condom but at one point did not use one. A few days after I kept getting a brown discharge that I thought was my period but it was coming and going for two weeks then stopped. I have yet to get my period and have been losing weight. I am also 21 so I have been drinking so I was not sure if that would have something to do with it. Any ideas?