It's a little bit fortunate that I am the reason we are waiting. I think my husband would be happy to try now, but I'm finishing a PhD and need to wait so as to time the birth for after I finish and after I complete any travel related to my PhD research. I will have to travel long haul next September to December at some point, and then probably again the next May, so we're timing so at the very earliest I would be due in June (if I get pregnant the very first month, which I doubt). I just can't be doing 11 hour flights when I'm about to pop or being stuck overseas and going into labour alone. My daughter was born at 37 weeks, so I expect I may have early ish babies.
So it makes it a little easier to an extent that there is just an absolute date, before which I absolutely can't have another baby. It also means I'm really busy and don't have too much time for thinking about it. I'm also not a particularly broody person. I wasn't really broody with my first. We just decided it was a good time so we did it. I'm a bit more so this time, just because I love the idea of having another that I could be as bonded to as I am my daughter (I get it now! Before I had her, I didn't quite get how I'd feel so I didn't feel like I was missing anything). But even this time, we're mostly having another when we do because the timing is good - it's a good time for me to take off on another maternity leave and I'm not getting any younger (will be turning 36 when we start to TTC #2).