HRT can take 3/4 months to work. 1 pump is an exceptionally low dose after a month I would try increasing it to 2 pumps. You may even need 3 or 4 pumps.
This what is so great about it you can tweak it yourself without messing around with having to get a new prescription.
Another tweak is if you are on 2 or more pumps is to try dividing the dose between morning and evening. I do 3 pumps in the morning and 1 at night.
It really is fantastic.
EDIT: It may take a good 3 or 4 months to get it right as well as notice an improvement.