Don't be pushed into it by a pushy FS... You need to feel calm and ready in yourself and in your relationship, and confident in your FS, and have a chance to talk about it with your partner, now that you know what is causing your problems, and what the recommended treatment is. It's a good idea to just let it sink in a bit unless there is a desperate rush for some reason. I think it's really important for you both to come to terms, separately and together, with your own answers to the question of whether or not the baby is 'meant to be here' if it isn't conceived naturally.

Will your chance of conceiving reduce dramatically if you wait for 6 months? Is it just the cost that is making him want to start straight away? Will you be able to afford 3 cycles this year but only 2 next year or something? Are you seeing a reputable, well-established FS who has plenty of business?

I'm sorry if this wasn't the kind of support you were looking for, it just sounds like he's being really pushy, and you're not really ready to actually start yet. I can't imagine that another month or two, at least, will really matter.