"AIBU to be horrendously annoyed that he took the risk when it would have been miserable to be carrying a baby he didn't want? I would have a c section birth and so would need help after birth - we have zero family support. I am so annoyed that he thinks that it's okay when I know if it did happen he would be miserable and still swan off and do his hobbies leaving me in the literal shit with two wee ones?"
Hmm. I can see you are getting frustrated with the replies you're getting on here, OP, but I have to agree you are sending out mixed signals.
You say you need to get cracking on TTC because of your circumstances. So, best get cracking then.
The fact is it can take a while to conceive and even when you do, there's still 9 months of lead time. That is time your husband can use to come around to the idea. In truth, it sounds very much to me as though he is willing, but just not prepared to be the one to push things forward, at least not in words.
If you really think he will not help out when the baby comes, then you need to accept that you are never having that second child. Because he won't suddenly "become ready" in 5 years.
Maybe you are fine with not having a second child. Make your peace with that and keep him in the loop.
OR, maybe you want a second child, but not with him. Wild card option. Again, only you can decide that.
However, if you want that second child, with him, then I'd accept that he may not be everything you want him to be in terms of childcare, but that you can use the duration of the pregnancy to talk to him and find ways of making it work.
Basically if you want that next baby, stop going back and forth and just get to it.