i m 16 and have been having my period since before i was thirteen but during the last year and a half my periods have been really irregular. last year i didn t have a period for 7 months had one for over a week, then none for another 5 months now its been bout 5 months again. My point is i weigh 7 stone and im 5ft 2 and my mum says i may be at risk at not being able not have children if i don t start have regular perioids. is this true?, cos i would die if it was. Please reply!! thanks by the way 7 stone is 98 pounds for those who asked