Make room for the other version
Ask what the other person understood before assuming that you are arguing about the same facts. For a message about how to share a fertility treatment failure, use this factual base: lead with the confirmed event, what it changes, who already knows, and any practical next step.
Correct the record precisely
Correct only what you can support, acknowledge any real impact, and propose a practical way to prevent repetition. Say what support or decision is needed now and make clear when no response is required. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Agree on a testable next step
Do not hide the central fact behind a long preface, speculate, or offer reassurance you cannot support. For death, abuse, medical emergencies, legal danger, or immediate safety risk, use qualified and urgent support first. Do not recruit an audience, publish private evidence, or turn a misunderstanding into a campaign about character.