Exactly a year ago I had a copper coil fitted. My usual periods were every 30 to 35 days lasting for a max 5 days. For the past year they're around 10 days long and every 26 days approximately. My last period lasted 12 days! I'm assuming this is caused by the coil but not certain. I have PCOS and used to skip periods all the time. Has anyone else experienced this with the copper coil specifically?