i reckon that one of the best ways of sharing information is sharing your stories. play up the positives of your experience or the negatives and chat about what you liked and wished had of been different ITMS. that way the person is not threatened and is in fact encouraged to share their journey through yours.

putting yourself on the defensive will only get them on the defensive and as all of us know pregnant women reallllly despise being told what to do lol!

HTH!