So sad to look at my clothes that don't fit.

This is my first pregnancy (29 weeks).. Pre-pregnancy a size 4.. My whole life I have been healthy, going to the gym, counting calories... It's so hard to look at myself in the mirror now... My arms, legs, and face look different as well..  I know I am just going to get a lot bigger. Sometimes I feel very depressed about it. I know this is petty, and trivial... I'm growing a human... Do others feel this way? Second time moms: does this feeling go away?