Hi Lisa
I hope its all going well for you. I know some that have had incompetent cervix after a full term pregnancy, so i would take it easy if i was you. Towards the end of the pregnancy the cervix will naturally shorten, but in the 2nd trimester I would think that anything shorter than 3cm is short. Saying that, people can have a short cervix without having an incompetent cervix.
My own cervix is nice and long pre-pregnancy, but it was 13mm at 19 weeks, typical for an incompetent cervix.
I hope you keep cooking for many more weeks! Good luck
Hugs
Kristin
Angel Mia's mum, born 19 Oct 2008
Abdominal cerclage by Dr Davis 28 Aug 2009