Periods not as frequent with Mirena IUD

So they said nothing would change but after 3 months of heavy periods and 3 regular periods (that’s 6) it seems that my periods are not as frequent. On my 7th period it took about 45 days to arrive. On my 8th period I didn’t get one. My 9th period, again it took 45 days before arriving. Now I’m here 55+ days waiting for it... I think it’s skipped again.

Anyone else with this problem or blessing?