im 18 years old and i am having some period trouble. i been having my period since i was 13 years old and when i got off birth control back in 2009 my periods went from 28 days to 36 days or more.some months ill go months and months without. ill go a few weeks late. or it comes when the 36 days are met but then after a couple months it wont come every 36 days. is there a reason behind this? i have a friend and boyfriend that is is due to stress and/or from the birth control use. can you please help?? i have many questions