All of a sudden, a menstrual cycle after 10 years?

[Esorgem]

So I've been on the Mirena for about 6 years (had a new one put in last year) and before that I was on the Depo shot for 4 years. I haven't had my period in those 10 years I've been using these methods in order to control my endometriosis and associated pain. Recently in the last month and a half, I've had two seemingly regular periods, this being my second, and I'm concerned that this is not normal as it's been a decade since I've had one. I've read about breakthrough bleeding but this is definitely a regular cycle as it has now been a little under a month since this first happened and now here I am again in agony with my second period in 10 years. Anyone else experienced this? I'll be seeing my doctor next week to check the placement of my IUD.

[Ladybirdgirl]

I felt that my sitation is different as I dont have endo but some similarities as follows. I had similar experience 24 hrs after my 1st pfizer vaccination, pelvic pain then 2 days later severe bleeding and irratic small bleeds and severe pain since. I was 2 years post menopause. I have a fibroid though, which suddenly grew in size, by 30 percent. The pain between and during bleeds has been abnormally disturbingly dreadful sending me to A and E several times these last 2 years. I have been on same does HRT for 10 years. It's confusing isn't it especially when meds havent changed?