From Kill Bill: Vol. 2
[Describing her pregnancy to Bill
] Before that strip turned blue, I was a woman. I was your woman. I was a killer who killed for you. Before that strip turned blue, I would have jumped a motorcycle onto a speeding train... for you. But once that strip turned blue, I could no longer do any of those things. Not anymore. Because I was going to be a mother. Can you understand that?
Yes. But why didn't you tell me then instead of now?
Because once I would have told you, you'd claim her, and I didn't want that.