Hello all, This is my first post, and i apologise for it being so graphic but and i am seeking some advice if anyone can help please? I am currently 23 weeks pregnant, and today went for an internal scan at kings to assess my cervix. It has been found that mine is only 13mm, where the "normal" "safe" range is about 25mm. This means that i now have a 23% chance of having a premature birth. I have, as are all women, been prescribed progesterone which has been proven to reduce this chance, however i have also been asked to take part in a trial which involves fitting an Arabin Pessary around my cervix. Has anyone else taken part in this trial, which has been running since 2008?