From experience, the best thing to hear is "I'm so sorry. That must be so hard". The end. No platitudes, no spurious advice, however well-meaning the intentions.
The chances are they've tried everything already to get pregnant: Sex, handstands, Natural Solutions, invasive tests and procedures, sacrist candles in empty catholic churches, wish cards tucked deep in coat pockets, 'relaxing holidays'. I tried them all and didn't get pregnant and the advice to relax from people who conceived the first month of trying was like being cut through the stomach. As was being told that sometimes "Nature knew best" as if Darwin was tossing a mental thumbs down at us from his fossiled grave.
Biology is subtle and slight and it doesn't take much to knock it off kilter. The once-fertile can become sub fertile and vice versa and there is no guaranteed way to influence it. My once-fertile husband was injured in a cycling accident (bike between the legs, head against a car windscreen) and so produces around 90-99% abnormal sperm with poor motility; barring a miracle he can't get me pregnant, although a brief but miscarried pregnancy post birth (the most stressful time of my life as it happens) offers us a tantalising glimpse of what might have been.
Fertility and infertility in the end comes down to luck and biology and there's something incredibly painful about that; but for the slightness of chance and biology I could be a mother.
I got my babies in the end, but it took a round of bells-and-whistles IVF to get them. And whilst I have my babies and my heart is healed I can still remember the cut of those 'well meaning words'. Relax; it's not meant to be; it's
God's way; have you tried going on holiday; in my day we didn't need IVF, people just had babies or got on with it.
Say how sorry you are and leave it at that. Or sit for a moment and think how you're REALLY feel if you were sat in an IVF waiting room and someone had just told you that you can't have children naturally. Watch your husband put his head in his hands because it's "his fault" and then see how 'try to relax' sounds. It's ashes in the mouth and in the heart.
For all of you going through it, I'm so sorry. I remember and know how hard it is.
Kitstwins