I found proof!
I was surfing some preggo blogs and I found PROOF that it is indeed possible to lack a bump! One girl had a barely noticeable baby pudge at 18 weeks. However, by about 23 weeks, she had an obviously pregnant, beautifully rounded baby bump. At this rate, my current obsession will be on display sometime within the next 4-6 weeks. Whoo hoo! I can now rest in peace. The bump is on the way.