When to start TTC?

Background info : we have a daughter who will be 3 in June! I feel ready to start trying for baby #2 but I don’t think my bf is on the same page. He says he wants another one but it seems to stress him out if I talk about it sometimes. He wants to wait a bit until some personal things in his life are sorted which I completely understand and respect. However it took us 5 months to convince our daughter - which definitely isn’t a long time at all but there’s no saying how long it could take us this time around especially since we don’t have sex nearly as much as we used to back then. so personally I’d like to start trying next cycle. I just don’t think he wants to, but I don’t think he also fully understands it can take a while. Do I talk to him about trying next cycle or should I just not mention it and wait till he’s 100% ready to start trying? I don’t want to stress him out again, or upset myself. Any advice would be appreciated. 💕