Does A Girl's Figure Randomly Change?

I'm sixteen, nearly seventeen, and I've been noticing something about my body. A few minutes ago, when I got ready to get into the shower, I noticed that I looked a bit different. Meaning, I felt like my figure was shaped more like an hourglass than a rectangle that looked a little "pinched" at the sides like it normally does. I sometimes notice this right before I get my period, my body LOOKS different, but my period doesn't come until the 2nd of next month.

Or maybe it's just me, maybe I'm seeing things? I don't really know, but something just definitely looks different about my shape. Is this normal or natural?
 
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