Can’t stop

Okay so there is this doctor at work who is EXTREMELY attractive and nice. I’m married to my husband and would NEVER cheat or do anything to betray him or our marriage nor do I have any intentions to, I love him to death and we are trying for our first baby. But I can not for the life of me stop thinking about this doctor and I catch myself fantasising about him! We share common interests and he’s such an outgoing person that it makes it so easy to talk to him! Am I a bad person for thinking about this? :(