Yellow why don't you ask him why he doesn't think it's ripping people off for HIM to work? It's just sexism thinking that women are going to cost companies loads of money. 9 months maternity leave (if you even take that long - I think you can share it now can't you? Not up to date with UK ML law), even a year isn't much in the scheme of things and if you're valuable to a company then it's nothing as they still have the long term investment of you. It's good for your future career prospects to have that step on there, too. Even if it's a small company, it's not like maternity leave costs them loads because the government reimburses the statutory part of it anyway.
Plus, being totally honest, many companies are more reluctant to hire women of childbearing age. It's not like it's a secret. They do know when they take you on that there's a chance you might get pregnant, so nobody is ripping anybody off.
TTC can take years, there is no use putting your life on hold because of it. Even if you got hired in say two months and got pregnant this cycle that's still 5-6 months before you'd be leaving anyway. Plenty of time to get things sorted, even in a new job. But I do think you should talk about why he seems to be assuming that you'll be the one to make sacrifices - to take the longest part of maternity/parental leave, to take unpaid time off to be a SAHM, to return part time, to arrange your hours around childcare, etc etc. Even if you want to be the one to do these things, it's definitely worth talking about it and not just assuming. It is an option for men to go part time, to stay at home or to plan their work around childcare availability too!
Ladies, do make sure you're on the same page with your men and that they are supportive and genuinely believe in you, not just seeing you as some kind of domestic assistant. I know the process of TTC, especially miscarriages, infertility worries or TTC taking a long time can be really stressful and can even make normally supportive, kind or loving people make crappy comments, and no worries - I totally support ranting about this! It's just I made the mistake with DS of choosing a man who was not supportive and it was such a lonely time and ultimately I wish I'd taken a much harder and more critical look at my relationship before I got pregnant, because once you're at that point it's sort of too late :( (Yellow I am not aiming this at you and I'm sure your DH is lovely and has just got caught up emotionally in the whole wishing-you-were-pregnant thing, it just nags at me occasionally, because I wish someone had said something to me. Plus, I think even supportive and nice blokes do sometimes need a bloody hard poke to remind them of the fact we all have biases and expectations which might not be strictly fair!)