I'm Turing 15 and my period hasn't happend since February I got my first period when I was 11 it started to become monthly 3 1/4 years later but then it just stopped in March and it hasn't happend since I am very overweight but that hasn't stopped it in the past I have noticed some dark hairs on my chin but it's really hard to see on my last period I bled less than normal I don't know what's wrong please help me.