Yikes - 3 kgs! I'd be wanting rid of that ( says she who has also put on a few pounds and slowly trying to shed it as we speak - though not successfully as I haven't been properly focussed on it!).
Nothing to do with HRT as I've been on HRT more or less the same type/dose for nearly 13 years and my weight has been up and down depending on how much I exercise and eat! It really is down to that as long as you don't have a thyroid problem. Having said that my metabolism does seem to be slowing down - but I am mid going-on late -60's so to be expected - I need to put more effort into keeping weight down! I think progestogens can have a bloating effect though so maybe Evorel conti could be partly a little to blame?
Have you had thyroid function checked? Also I'm sure you know =- cut down sugars, excess fats, refined carbs and eat lots of fruit, veg, lean protein, pulses, nuts whole grains etc. Body conditioning to tone up those muscles so they burn more energy at rest....never buy bigger sizes in anything! Brisk walks daily. Exercise classes.....
Good luck!
Hurdity x