Irregularities on Mirena IUD

Rayne

Hey guys! So ever since I got the Mirena in 2015 my period has been SUPER irregular sometimes not even happening. Is this something that other people experience as well? I mean my doctor said it was fine and happened loads but you know anxiety and stuff. I'd just like to know if it's relatively normal. Also, in the year before having to get it replaced does it loose it's effectiveness? Thanks guys! I look forward to your answers!