PARIS: What do you think, a boy or a girl?
SEVEN: It's a holographic projection.
TORRES: Unfortunately, it's a very good projection. I feel twenty kilos heavier. It even kicks.
Now she doesn't say it feels like it is inside her so I'm thinking it feels like a huge weight on her abdomen with kicking pushes against her. It would be very creepy though if under her clothes there was a holographic skin illusion swollen with weight attached to her body.