3 week period on my 6 month on the IUD

Pr

So about three weeks ago I was expecting to start my period and when I did I noticed it was a lot lighter than usual. I got an IUD inserted in January so it's been a little over 6 months. I did remember my obgyn did tell me my period would be different month to month. So I just expected a normal/light period.

It has been 3 weeks with the same consistent bleeding. Has this happened to anyone? Is it normal?