"Too late?" He was a guy, he didn't think like she did. If he saw that he'd forgotten something and had an oh shit moment, he'd pick it up and start taking it again.
He wanted to believe her, that she'd just forgotten. But there was a nagging voice telling him she wanted kids. And she probably thought that was the only way to get them. Was that an unfair reaction? Maybe. But that's how it felt. "When did you realise you'd forgotten? How long ago?"