While I love the idea the execution needs a little tweaking. First the woman is getting squashed looking from the way she's laying back and the angle of the camera to her. I'd prefer not to ever have a flat on belly shot in a maternity anyway as it makes them look flat fat more than that beautiful rounded bump.
The curtain being half behind her, half not is a REAL detraction. Either all wall or all curtain, but not half. I understand that that may be where the window is, but if that's the case choose a plainer looking background area or extend the curtain for now.
How about something like the name on the baby's dresser or crib... and mom with her rounded belly at the crib next to it, standing up in profile so you see one hand touching the belly...
I can't totally save that white balance without major playing with the colors:
White balance-you've already gotten the talk from everyone else, but it is REALLY bad on this one. Warm is fine, but this is orange.
Less is more-less distractions, which you seem to have tried to do well for the most part.
Posture and posing is HUGELY important with pregnant women. THey're a bit sensitive about their size and you want to show the bump, not the "I feel like a house" look.