About Touka’s choice
I think it’s important to realize that Touka didn’t just choose her baby over Yoriko’s (her best friend’s) survival.
Because, as a matter of fact she did, she tried to stop Kaneki from going, to save him too. Remember in the last chapter?
And in the new chapter…
Touka is not an idiot. They have talked about it before (ch122), so when she saw what he had hidden under his pillow, she realized that he was thinking about going to rescue Yoriko, which means that he was ready to endanger at least himself (if not some of his followers/their friends) to rescue just one person, probably all the more because this person is important to her.
That’s why she didn’t say that she saw the paper about Yoriko’s death sentence, rather telling him that she was pregnant.
Touka learnt her lesson during the Anteiku raid arc…
And she doesn’t even care about this rebellion, because living while you still can is the best she thinks she and others can do in this twisted world.
To be honest, she’s probably never going to forgive herself for what might happen to Yoriko, however in this chapter, trying to stop Kaneki when he simply can’t save everyone (and when he’s so tired) was the most important to her. So she went against her own wishes and told him about the pregnancy, even though she’s aware it might not be viable.
This chapter was sad. Even Kaneki’s wedding “proposal” is him basically apologizing and trying his best because he can’t choose. ;_;