Hey Meags
I think this will be tough to change your DH mind on. He obviously has an idea of what he thinks it'll be like but as Julz & the others say, you cant prepare for it and if he's not open to hear what it could be like maybe he's not ready.
And even if you convinced yourself now that you could do all the travelling / take a nanny with / leave baby with a nanny, once that LO is here, you would not want to do that when they are still infants!
Most people only get comfortable leaving baby somewhere (usually granny) when they get close to a year, and even then they worry all night and dont do it often except for occasional outings / date nights.
At this time I'm ok to leave her with MIL for 2.5hrs on a saturday so we can go to gym and do grocery shopping which is a luxury in itself

And 2 weeks is a looong time. How much of your baby's development are you missing?
I agree with Vix's statement re having children. Its not that you'll never get to travel again - but its a part of your life that you'd be putting largely on hold because of the impracticalities, plus the experience is just different. And once you do start travelling with your 5 & 7 yr old for example, you're likely to think twice about where you'd be going, because the holidays would largely become about things that they will enjoy not to forget 8pm bed time...
My parents would go to a hotel, and leave us at a childcare service in the hotel when they went for dinner / casino / who knows what else! But we were not babies or toddlers.
If you are both young, and feel that a year more of travelling opportunities without the worry of children will be good for you, then I'd say go for it! Never know you may conceive on one of your enjoyable beach parties

But have an idea of when enough is enough and you are ready to reconsider.
As for travelling while pregnant - it's doable but first trimester you're exhausted & nauseous and long road trips may not go to plan! And third trimester you're uncomfortable, swollen feet, and start waddling. I would highly recommend everyone try get away during 2nd trimester, but not the rest.
Aah and also, the type of things we'd have liked to do - quad biking / horse riding / water skiing / ice skating - couldnt do any of those while pregnant. So also something to think about.