Zoladex and Mirena question? Need help.

[MiyazakiGirl]

Okay so I’ve been on zoladex for two years awaiting a hysterectomy but due to covid the waiting list is so long they have taken me off the zoladex as the gynae doesn’t want me on it any more. So I had a Mirena fitted a week ago with the hope it will keep my periods away. My next zoladex would have been in two weeks time so I’m not at the end of that treatment period yet however I’ve started bleeding. I’m not sure why or what it means and I’m hoping someone here can help me shed some light on what’s happening. The day I had the Mirena fitted I had bad cramps and minimal spotting but that was it. Now it’s heavier bleeding and I’ve started cramping. As far as I understand it It shouldn’t be possible to be having a period right now as I have been amenorrhea for 18 months now. Any ideas?