You might find this thread helpful:
https://babyandbump.momtastic.com/g...cervix-stitch-cerclage-threatened-labour.html
I had a 3.0cm cervix to start with (due to surgery), then 2.6cm at 16.5 weeks, at 17.5 weeks it had shortened to 1.7cm so I had a cervical cerclage at 17.5 weeks. I'm now 21 weeks and on daily progesterone 200mg vaginally. I'm on modified(ish) bed rest and am working from home.
Over in the UK they consider 'short' less than 2.5cm, but don't think about doing the cerclage until it approaches 1.5cm, so on that basis you wouldn't even be considered short here, you would probably be monitored. Make sure you have weekly or maximum fortnightly vaginal ultrasounds so they can keep an eye on you.
Both my obstetricians said that bed rest doesn't make much of a difference (not sure I agree with that) but that it is more to do with stress - if you have a busy job, long commute, and work long hours, this can have an adverse effect on cervix length. I am now working from home probably for the duration of my pregnancy. I am taking it easy, with little exercise, and drinking loads of water (this is important to keep up amniotic fluid levels and prevent early contractions). No sex or baths either (infection risk).
The cerclage itself was fine, it's a proper surgical procedure in theatre though, with a spinal block and a cast of thousands. I didn't feel a thing of course, it wasn't my favourite experience in the world and I stayed overnight in the hospital, but for my baby it is all worth it, along with the change in my life by having to work at home. Luckily I am able to do this with my job.
A short cervix doesn't mean a weak cervix, so as long as you are monitored as I was then they will be ready to act should it shorten further. As for the progesterone, they don't really know how it works but it does.
You might need to carefully consider your working arrangements and what you can change. I know it sounds a real pain but it is worth it for the baby.
Good luck and feel free to PM me if you need.
Elodie