I would not be worried at all, I have read that this is just the beginning of your period. I know you've never had this happen before but "Brown Blood" means old blood so it could be left over from your other cycle. There is nothing to worry about and you should begin flowing soon! Although if this keeps happening this month and you never are fully on your period, i would talk to a doctor, you could have vitamin deficiencies or something, I'm not sure what else it could be, considering you are still a virgin.

Normal :)