I HAVE A FRIEND WHO IS 15 AND SHE HAS'T STARTED HER PERIOD YET AND SHE THINKS THAT IT IS BECAUSE SHE MASTURBATES. SHE IS REALLY AFRAID. CAN U HELP HER PLEASE.
If she is not sexually active yet, but only masterbates there isnt any reason to be concerned, she just may be a late bloomer, some gilrs dont start there periods until they are half way through there high school year...If she doesnt start by the type shes 17 then I would suggest going to an obgyn it could be something else..but then again it probably wouldnt hurt to go now just for a check up...