True, but most developed nations have easy access to IVF and/or other conception medical services.

Another question might be...what % of couples can get pregnant without artificial means? And how is that changing over time?

For perspective there are estimates out there that IVF will be involved in 10% of pregnancies in the near future. Some of that is it getting better, cheaper, and more accessible obviously...but we are talking about something (pregnancy) that's technically "free".

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8722744/#:~:tex....