Sometimes people who are involved in lucid dreaming will end up doing reality checks in their dreams ("day residue" - things you've thought about or did during the day that ends up in your dreams). The person might also believe they're dreaming, or say they're dreaming, without actually KNOWING it consciously. There's usually no burst of awareness in these dreams like there is in a lucid dream, which is a good signal that it wasn't one. But I'm not sure if you felt that awareness or not, so I can't make a conclusion.