zoogy I noticed you said "we don't have sex as much as we used to". If you have gone from occassionally having sex to full-on BD'ing then its not just a question of pressure from the idea of making a baby, but also him maybe needing to adjust to a new you in a re-structured sexual relationship.
If this is the case, then all the advice to BD regularly might not be helpful.
For DH and I who after years of being together had slipped into comfortable happy evenings of late night reading and watching films together, the sudden switch to SWI when we'd rather be doing something else wasn't easy.
So, contrary to popular opinion on MN, our fertility monitor, my ferning microscpe and charting all help to keep us sane, and Dh follows all these things as closely as I do! It means we know when we can BD, and when we can spend evenings doing other stuff we also enjoy together. If you think about it: advice to BD regularly throughout the cycle is, for some people, exactly what scheduled sex is and also very stressful. Pants to that!
So I think you need to have a really good talk to him. There is no 'right way': you need to find 'your way'. And by 'your' I mean you and your DH. You can't force him to do what you want him to do. So don't embark on any solutions until you fully understand how he's feeling and what is worrying him.
Above all, you're in your late twenties and you have time to ease into this and get used to the changed terms and conditions. After three cycles of this, I think a break might be in order while you talk and sort.
Also, keep in mind that high stress can play havoc with cycles which isn't good for conceptions either. So its very important you go gently on both of you.