Perimenopause and hormones

Ok I'm 47 years old and perimenopausal. I reached my goal weight. Yay! But the last 50 lbs. off I didn't lose a single inch of my waist. I would still like to lose about 10 or 15 more pounds, mostly from my waistline. But you can't target weight loss. I'm thinking the odd way I'm losing weight is due to my being perimenopausal. And think that maybe a low dose birth control might help. Or hormone replacement therapy. I would also like help with regulating my cycle as it's very short right now. Anybody have any insight or knowlge about this? Perimenopausal women on BC that are losing from their waistline? BC suggestions? Any help would be very appreciated. Thanks!