Can Perimenopausal Stage Cause Extended Delay In Periods?

I just turned 50 years old and am in good health and shape (weight 114, height 5 7 , exercise 5x/week)I have not had a period for 18 months. I ve mentioned it to my gp, and she is not concerned, said I was perimenopausal. However, recently my breasts swelled, like they do before a period. I asked her to take a hormone test and my hormone levels are in the normal range.Is this normal, or something I should have an ob/gyn check out?