thinner thighs and hips/butt

Hey, So I have been at college for the past few months and started running on the treadmill. I would do the treadmill then do lunges, squat and some ab exercises but when the gym was full I would get on the elliptical. When I got back home I started running outside since we do not have a treadmill (yet!) and kept up with my squats and stuff. At school I was feeling and seeing differences in my thighs and butt (they were getting smaller and I was going to have to drop a pant size soon) but when I got home and started doing the same stuff my butt feels like it's getting bigger or perkier. My mom says it's probably because I had a bad reaction to peanut butter and since it is making my stomach swell it is making other parts of my body swell. So I was wondering what other more experienced people had to say. Should I keep running? or elliptical? or just walk? or something else? Thank you

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