yes, you may listen to Paraliminals when pregnant. Anything that brings about postive emotions in you will certainly be benefical for the baby.
Favourites are, Prosperity, Personal Genius, Memory Supercharger, Perfec5 Health and Holiday Cheer. I wouldn't use any techniques that would deliberately create a major upheaval while pregnant. Experiences like that have been found to create challenges for the child later in life. But if you chance to have an upheavel I'd use the Paraliminal that would help you to handle it best.
Alex