Hi. You are peri menopausal. You really had very heavy periods
and fibroids do cause heavy bleeding, but it depends on its site and size. You are having it for the first time, so may be reason is not fibroids .Get a scan done and see if the endometrial linlng has gone extra thick and bleeding.
For this you will need an endometrial biopsy
and treat the cause. So, certainly you need to get checked and investigated.