Im sorry I dont know much about a short cervix, but I was just checking to see how you were going. Have you found out anything from your doctor yet??
Sorry to hear you are having preterm labor symptoms. I went through that with my son starting at 17 or 18 weeks and I know how scarry that can be.
Have they done an exam yet? Once a short cervix is detected they should start doing regular internal exams to check for dilation. If that starts then you can look forward to being put on the tributaline or some other type of labor stopping drug and bed rest for the remainder of your pregnancy.
Either way it's better that they caught it early. I ended up being dialated to almost 2cm by 20 weeks and went on serious bed rest, but still made it to 36 weeks without having to be put into the hospital. In my case it was too late to even try a cerlage by the time I got in to see my doc.
Until you can get in to see the doc I would stay off your feet as much as possible, try not to get stressed, drink lots of water, and just over all take it easy. This does not in any way mean certian pre-term labor, but your dr will want to keep an eye on it.