hi..im 20 year old..i have never had regular periods since they started 5 years ago..sometime they are there for 14 -15 days and then i have to take medicine so that they stop and after that they are like absent for 4-5 months.but this time..its almost after an year that im having bleeding ,last year i was on heavy medication for some injury is it due ti that..i am scared!! HELP!