I have a short cervix as well, and the doctors were concerned about it shortening and the dialting too early, causing me to go into preterm labour. Even with that, I saw my doctor every 2 weeks from 17 weeks to 27 weeks and then once a week from then on...so if you don't think your doctor is doing the right thing, make an appointment and tell him or her and if they don't do what you need, find a new one. Dont risk your baby for a stupid doctor!
Short cervix- I had a LEEP to. I was on light bed rest from 17-27 weeks, then my cervix continued to shorten to just 1cm in length, and was on full bedrest, hospitalized on and off from 28 weeks to 36 weeks. I saw my doctor on a regular basis, lots of ultrasounds, non stress tests ect...listen to your body, it will tel lyou if theres a problem...thats how I found out my cervix shortened more, I felt weird and went in. Nothing ever happened though, my son was born at 40 weeks and 1 day, 7lbs 7oz. They say when I have another, they will only put me on bedrest if I need to be on it, that they now know I have a short cervix and they will just watch it and go from there, its not the same as an incompetent cervix though, with that your cervix just dilates uncontrollably, it can be much more serious.