Carrie,
I have a short cervix in pregnancy, my 2nd preg was 1.6 at 19 weeks and all the health professionals told me I was ok things didnt turn out favourable in that pregnancy and I delievered her at 20 weeks.
I thankfullt found a wonderful obst who gave me a cervical stitch with Eliza and all throu her pregnancy we stayed above 3 cm, I was told if I shortened to 2 I would be hospitalised. Eliza was born at 37 weeks due to GD and was a 8'8 hefer on that stitch and it never flattened. I'm at work at the moment..I'll send you throu an email when I get home with some more information.
Take it easy no lifting and lots of feet up
Bec