Hi,
I am currently 16w6d pregnant and I had a preventative cerclage done at 14w. My peri had told me it was an option and that it works best when it is done prior to when it is determined to be needed (emerg cerclage). I decided that I wanted to do whatever I could to ensure my babies stay in as long as possible especially since this is my first pregnancy longer than 9w. Everything went great with my cerclage and I am glad I did it. I am sure there are others who may have different stories as there are several others who have had cerclages.
~Angie