Theodore nodded. As much as the idea of a pregnant veela frightened him a little - from the research he'd done, they weren't exactly friendly creatures, even to their mates, and unfriendly creatures tended to get even less friendly when their children were involved - he thought it was probably the most likely possibility. Especially since Fleur's response told him that she was having sex.
Not that he was surprised by that; she was very pretty, and she had the thrall, that was the point. "I think you should," he said, tightening his grip on his notebook ever so slightly. "If it comes back negative, I can look into other possibilities - but the chances of some kind of rare disease are lower than the chances of failure where contraceptives are concerned."
He gave her a small smile. "I'm sorry if that's not good news. But if there's anything I can do to help once you've taken the test, let me know."