In the first several months of our marriage, my wife and I had difficulty getting pregnant even though we were trying regularly and often, seldom ever missing a day and as many as 3 or 4 times some days.
But no luck, so we checked into possible medical causes. It turned out that all we needed was a change in positioning and shazam! Three beautiful daughters in less than 4.5 years.
Those few short months taught us to be more sympathetic to couples who weren't so fortunate.
Very often there are techniques to restore true fertility (the ability to get pregnant via marital intercourse) involving things as seemingly simple as a different diet, wearing boxer shorts rather than jockey shorts (yes, gentlemen, this has a big impact on sperm count), correcting abnormal hormonal levels, or better timing (using NFP to pinpoint the best days for conception.)
Some of this can be founding under the heading of NAPRO-TECHNOLOGY
I wish these things were MUCH better known, because OB/GYN's often go straight to expensive, often unsuccessful artificial reproductive technologies rather than seriously diagnosing and correcting the reason for the infertility.
The Catholic Church prohibits artificial insemination as morally objectionable.