I didn't get my cycles back till DS was 16.5 months. We had decided already that we'd try naturally for a while, then go back to IVF, so I night weaned at 14 months to bring on af and we did that. Of course we didn't conceive naturally, so went to our first FET when DS was 23 months.

I knew I didn't want to wean early to TTC again, nor did I want a close age gap. We were also lucky that DS was conceived on our first transfer and we had 6 embryos in the freezer. DD was also conceived on the first transfer.
I think having one baby 'in the bank' as it were, as well as backup embryos on ice did take the pressure off a bit. Yes, the cost had definitely gone up heaps, but physically doing the FET was easier for me. Of course, it's always easier if you only have to do one cycle - it would be different it we'd had to go back again and again.

I guess we'll do much the same next time round - we have 2 embryos left and might be so lucky again.

Good luck!!