Since readers have insight into Sephy’s perspective in addition to Callum’s, it’s clear that Mr. Hadley is lying: Sephy genuinely wants to continue her pregnancy, and she isn’t staying pregnant just for Callum’s sake. But it seems as though Callum hasn’t had a chance to speak to Sephy since that night in the rose garden, so it’s unclear to him whether Sephy has changed her mind since then.