A friend we know suffered a miscarriage. She was 6 weeks along and had not yet announced the pregnancy. Her husband shared the news with us. Should I send her a card/note? These are not GREAT friends but people we do see a few times per year.
Since your friend's husband did share the news of the miscarriage with you all, it's perfectly fine to send a simple note expressing your condolences for her loss.
Be sure to avoid saying things such as
"It was God's will"
"Maybe something was wrong with the baby and this is nature's way of handling it".
Suffering a miscarriage carries the same emotion of grieving for the death of a loved one so it's important you remain sensitive. Don't mention things about
and such, the couple may really need time to heal before trying to get pregnant again. Just keep your message short and simple. Something along the lines of:
"We're very sorry to hear of your loss, our prayers are with you during this difficult time"
should be sufficient.