Why are my hips getting wider?

peace-love-couture
I got my period when I was 9 years old and I'm 19 now. I feel like my hips are spreading more and more

If it matters, my measurements are 37-24.75-37 (bust--waist--hips)

I've been doing this core workout dvd that came with a medicine ball I bought from wal-mart and I started going for 5 miles(run 1/walk one etc) recently so I think my midsection has slimmed down...

but I feel like my hips are getting wider and wider.

my legs are like hers except my calfs(right word) are bigger

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Is it my workout routine?

I'm only 114 lbs so I feel like it looks bad because I probably look boney or skinny and toned...
Why are my hips getting wider?
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