Today I parked in that spot.
After all, I am a mother to be :) When that will be, I have no idea, but it will be. I had to go to my hospital to pick something up real quick so I went to park in the front as opposed to employee parking. I pulled up close to the front where I had spotted an awesome spot only to be confronted with the sign: parking reserved for expectant mothers or mothers to be. I thought, well, this is definitely the spot for me, and pulled right in. It was great.
So if you see a sweet spot like that go ahead and park--the sign applies to you my fellow mothers to be.