I am a 16 year old girl, I got my period on time for four days ( that's normal ) it stopped for two days and I got it again, its been three weeks now and I still have it.. its non stop but there isn't a lot of blood.. I've never had sex and I am not on any kind of pills. I'm starting to get really worried so please answer

Tell your mom to take you to the OBGYN and have this checked out. My sister had this type of problem when she was 16 and it turned out to be a cyst on her ovary that needed removed. She then went on to have 2 healthy children when she was 20 and 22.