He blinks and pauses, but they're still holding hands so he shuffles along again quickly because she doesn't stop walking. She can't be trying to end the conversation with that. He knows she is, but it feels like a weird whiplash.

"Good - good talk?" What?? This was not much of an actual talk, Jyn! She can't possibly be trying to end the conversation, because she's implying that she maybe wants a baby and that's that, but she should know by now that Cassian has a Thing with being direct.

"Does that mean you do want to keep it?" She just said she didn't know if she ever wanted kids, and now she's talking about their families and a baby! It is typical Jyn, but this is the one time he can't let it slide.