Dory I have only been pregnant 3 times. 1st was an early M/C when I was 19, then Taite and Seth, now this one.. I had a stitch with the twins but it was an emergency one placed at 19wks when my short cervix was discovered at my scan.. Although the OB thinks there is every chance things would be different with just one baby instead of twins, I would have been having weekly scans to check the cervix and if there was any change I would have had to have one anyway, so yes this is definitely a preventative thing. I may not need it, but why take the chance. Weekly scans would be stressful. I would always have to be prepared to have a stitch put in anyway.. Not to mention I don't think that many scans would be great for the baby. I am praying so hard I get to full term (well 37wks) with Button, but I know anything over 32wks should be ok.