Hello, I am a 19 year old woman, and I have not had my period since May of this year and I know for a face that I am not pregnant. I have the feeling that I am about to start my cycle because of all the signs that are happening to my body, but that's been happening for the past 2 weeks. Also, there is light brown gooey stuff coming out of my vagina. My mother says it's just old blood from the periods I haven't had, but I don't know if that's completely true. Help?