This looks like it was a very rushed shoot and I have to say that I'm not a fan of the black and white in every shot, especially with it being a very flat black and white conversion.
I do not like the selective coloring, but I can see the use of it in the first one.
Specific C&C IMHO:
1. This is a very bad cropping of an already bad position for her. It isn't flattering at all. The background is blown and distracting. The crop is right through the knees and shoulders and there's a piece of her hand at the bottom of the frame.
2. Again, very unflattering, as someone else said it does not appear to be a pregnant belly. If there were no props you would not know that she was pregnant. And again, someone said about the blocks running down the leg. I don't understand it and it leads the eye down her leg to where you chopped off her feet. The background is again, an issue.
3. Her crooked shirt (neckline) is the first thing I noticed and the second thing was her crotch. The straight on view is perhaps the most flattering angle for this mom-to-be, but not in this pose.
Oveall, it's not just awful. Was this your first shoot? There's grand room for improvement, but then again, there usually is, with anyone. I know when I'm looking at my final edits I often curse myself for not seeing "that" (whatever that may be) sooner. I would work on the edits some more and see if you might have some more flattering angles of the mommy. She's cute, but these don't flatter her and in the one picture where you can see her face she looks almost sad.
I hope you continue shooting and take all these things with a grain of salt and it helps to push you to improve and grow as a photographer.