D.K.
You're probably not pregnant - but you can get a test and do it at home. See a doctor - you should not be having regular menstrual bleeding 2 weeks out from your last period and you're too young for menopause. If things have been "hot and heavy" recently, you could see some blood, but definitely not like a regular period. It's nothing to panic over, but you really do need to see your GYN.
Good luck!