Hi, I am new to the board. My name is T. Joe, I am 29 and have a degree in biology. I have two children... and thank heavens that I have them because I have miscarried more times than I like to count. Even then my body serves the evicition notice at 33 weeks gestation.
Misscarriages are more normall than you would think. Aproximitly 1/3 of all pregnancies miscarry with in the first trimester. Many happen before people even accept that they may be pregnant. So, this does not mean there is anything wrong with your friend. Often it is a sign there was something wrong with the pregnancy, poor attachment... there are thousands of differnt reasons... but I would recomend she be checked out just in case.
In my case I found out later that I had uterine polups. Her Dr. may want to do a D & C -> which really means scrape and collect. IF HER DR. DOES THIS she will need someone to drive her to and from the Dr. and take care of her for awhile and she will want some apin killers and dang good ones. This is a invaluable proceedure but HOLY COW it hurts. So she will need someone to bring over a few meals, etc.
As far as being a friend all you can do is love on her. Take her out to lunch or soda and just let her talk about her feelings. She was abviosly excited to be pregnant... so encourage her to give it a bit of time (use protection) for at lest three months to give her body a chance to heal. If she tries right away after a miscarriage she is likely to have more problems, just like with anything.
I personally like getting pregnant in the fall so I deliver in the spring and do not have to suffer through summer pregnant.
I hope this helps