Pregnant or just fat?

Cindy • I'm 34, SAHM to 3 year-old girl and brand new bouncing baby boy!
I swear people still act surprised when I say I'm pregnant! I'm 28 weeks tomorrow. I lost 15 lbs my first trimester and so far I've stayed steady at that weight! 
I mean, I know sometimes people don't want to say anything about pregnancy, but jeez. I feel like it's pretty obvious!