I don't think your bump looks any smaller. But I know how you feel! Sometimes late at night I'll look down at my bump and feel smaller than normal, and then other times (like right now lol) I feel HUGE. I think it depends on whether or not you have an empty stomach and baby's position.
Baby's position and where their little feet are pushing out makes a big difference on how much you are poking out. I know that mine lo hasn't dropped yet though, those toes are still in my diaphragm.
I was measuring significantly smaller, 28 weeks, at 37 weeks. The dr was worried maybe I was losing fluids. She ordered an ultrasound and all was fine. She thought maybe the baby had just dropped. If you're concerned though call the dr to ease your mind.
Re: Did my bump shrink? (Pic)