Hi congrats Fraggle on your pregnancy. So are you due in August or will it be September?
I had my first son at 25 weeks and we lost him at 2 weeks old. It was assumed i had cervix issues as I had painless dilation but its hard to diagnose. When not pregnant my cervix looked to be around 2.5cm tho its v hard to measure apparently. Never had any procedures on my cervix so its a mystery.
I got an emergency stitch with my first son that failed but a preventative stitch (high shirodkar) at 12 weeks with my second son who I had at 35 weeks though stitch did its job very well, I had painful dilation so could have been pre term labour on that occasion too.
From what I know, drugs are not a substitute for a stitch. Diff docs have very diff opinions about what is best/needed! I saw about 5 docs, who ranged from saying 'wait and see' (then do an emergency stitch if necc) to going for a transabdominal stitch.
I took one 400mg dose of progesterone daily too. I have a friend who had her first at 34 weeks and had her second on progesterone alone. Difficult is these issue are so difficult to diagnose so it may have been 'just one of those things' why she had her first early.
Post stitch i personally don't get scanned internally. This is on the basis that you're at a higher risk of infection post stitch so basically I do everything I can to avoid any issues, like I don't have baths, swim etc etc,. So no scans for me but everyone is diff. The prob with no internal scans is internal scans are the only way to accurately measure the cervix but you can get an idea from abdominal scans (e.g funneling).
You could go for the wait and see and have a stitch if your cervix shortens by having regular internal scans. However, the problem is it could be overnight so its a bit of a gamble about catching it in time.
In terms of the stitch bursting, i had similar fears but i went into full blown labour with my stitch with my second and when they took it out (almost 10 hours after the first labour pains) I was over 5cm dialiated. So it does hold well! Plus things don't tend to happen super fast, they could take it out in minutes and give you pain relief that is very quick acting.
Are you close to a good hospital? That helps! I also didn't travel any distance from the hospital at all. I was pretty much always 15 mins away max. Hope you are in a similar position.
Regarding bed rest, again docs are very different. In the US its often recommended but rarely in the UK, especially not long term. I put myself on house arrest for a good few weeks, especially around 22-26 weeks, just because of the timing of having my first. But this was all self enforced rather than prescribed.My doc told me to continue as normal but this time I am finishing work at 12 weeks post op, wont be exercising, will have to do as little lifting as poss with my toddler son etc.
Hope that helps with some of your questions. Everyone is different though and you obviously went quite late with your first and so it may be you don't need to have the same kind of treatment, say I do.
Good luck and keep us posted x