period on Skyla

I got my Skyla inserted almost a year ago. I've always had very heavy and very irregular periods. Since getting Skyla, they have still been irregular, are lasting longer, but not nearly as heavy. They have slowly been getting lighter and lighter, but I've still had something each month. This month, nothing. I've had all of my normal PMS symptoms, but no period. We always use condoms (I tend to get paranoid) except for one time, so I'm pretty sure I'm not pregnant. Anyone else have their period stop completely this suddenly and this long after getting the Skyla inserted?