this isn't pregnancy related. maybe you'd get more appropriate responses in one of the womens health forums.

it could just be that you're still young and your cycle can still be changing. i'd consider less bleeding a good thing. if you're concerned go see your doctor.

i am 24 i suffer with the period problem from 4 years.i am takeing treatment regular my doctor gives me pills when i stopped take the pills periods not come if its come only for 1 or 2 two days & less bleeding.scan take by the doctor before 2 years its shows:
polycystic ovaries,to be correlated clinically
tablets name which i take regular:-
deviry
eftormin