Belly smaller?

I am 18 weeks today with my 4th pregnancy(1 living child whom is 9). I have not yet felt any definitive baby movements. I’m pretty sure I have felt her a few times but nothing for sure. The first picture is last week at 17 weeks and the second was taken today. I feel as though my stomach seems a lot smaller throughout the last week. What do you ladies think!? TIA

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