Belly size??

Christina • 20 year old married Mommy of 2 healthy active boys ages 2 & 4 & expecting baby on November 25th 2015 :)
Okay so I am 27 weeks & 1 day with my little princess today I woke up & feel as if either my belly has gotten smaller or its dropped a little bit..... What does everyone else think? The picture with me in the white top I was 25weeks & then blue shirt is today... Am I going crazy? This is my 3rd baby