Period won’t stop!

Desi

So my period is usually only about 5-7 days long, but this time it’s been almost 2 weeks regular-heavy flow. I’ve had the skyla IUD for almost a year now and before this my period were either normal or starting to end (getting shorter or skipping). Before this period started I went to the Gyno and she said everything looked and seemed normal. Does anyone have a similar experience or any idea what’s happening? Should I be concerned?