No period on mirena ?

I’ve had the mirena for about 4 months now I’ve had a period for the last 2 months now I’m on <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period calendar</a> I should of started like 2 days ago... is it possible for my period to have stopped? I have no pregnancy symptoms I’ve took 2 pregnancy tests last week and both negative? I can feel my strings and they are in place. I have like the discharge before my period and cramps.