I Have Had A Mirena Coil In For Over 5

I have had a mirena coil in for over 5 years. over two years ago my periods stopped and I have had all the menopause symptoms. I am 50. I have just had my mirena out as I was suffering with vertigo and gynae thought it was connected. Now a month later, I have seen light bleeding. I had the FSH test which said I was post menopausal two years ago. Was that accurate seeing I had my coil in?