have you asked him what kind of age gap he sees as ideal between his children? Maybe starting a discussion like that, which isn't directly talking about a date to TTC, but instead is asking about his input might get him to thinking about things from a different angle. I would be wondering what he thinks. What the age gap was between his siblings (if he has any) and just have him pondering about that type of family planning. Maybe he'll realize that things need a more definitive plan of action. That even if you TTC right now there would be a 3 year age gap. Wait any longer and that gap increases. Plus it would just be interesting to hear my husband's opinion on such matters! Bring it up very casual, in a non-confrontational way that is just a fun, interesting discussion