Petite girl with big booty started doing squats, underwear getting looser?

Anonymous
So I've always had a big bum for a girl my size, and I recently just incorporated a heavy squat routine with circuit weight training and a bit of cardio. But I realised most of my underwear are now very loose or they sit lower and often my jeans tend to pull them down my crack..
I have a firm butt now but does that mean that my ass has gotten smaller since my underwear don't fit anymore?
It's weird I thought squats are supposed to make my bum bigger haha
Updates
+1 y
I'm 164cm (5"4) and weigh 46 kg
Petite girl with big booty started doing squats, underwear getting looser?
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