Actually it was a donor egg. In theory it is now possible to get a woman pregnant at any age, whether or not she has hit puberty, menopause, - or even whether or not she has a partner or "good" eggs. Now the question seems to be whether or not it is ethical.
Keep in mind that if you have a child at 66, you'll be well into your 80's before they leave home.
You would go see a doctor about it. Could be early menopause or pregnancy. Also, since you have fibroids that could affect your cycle as well.
I was 66 when it was all over.