So I am turning 16 if it helps but my period usually last 5-6 days or sometimes 7 but this month it only lasted 4 days? And it started with normal medium to heavy period for the first two days and the third day it was like a bit more then nothing and today the fourth day it's basically nothing. Usually my period stays heavy throughout the 4 days then around the 5 or 6 day it lessens so is there something wrong and I'm a virgin so please help me understand what could be wrong