Quoting Amelia Margaret:" That would have been too late for me as my water broke at 15w5d. Right now I'm fighting for a transabdominal ... [snip!] ... but I haven't had a failed vaginal cerclage so it will be harder to get approved. It's causing me a ton of anxiety right now."
Have you been to http://www.abbyloopers.org/ ? It has a ton of information there for TAC people. There are 2 doctors that most women use Dr Haney and Dr Davis. I've heard great things about both. They also have another option called the TVCIC. It's like a TAC but lower. I can't remember if it can be placed pre-pregnancy or not. I don't think it can, but it can be permanent or removed.
In the world of cerclages, higher = better and more invasive.
Most women get Mcdonalds (I've had 2 of those which worked fine). Those are placed the lowest. Sometimes people get a double mcdonald.
Next highest up is a shirodkar. It's placed higher than a mcdonald and they have to move your bladder and rectum out of the way to place it. It takes a little longer to place and for me it was more uncomfortable during placement and afterwards, but it worked fine too.
TVCiC is up higher than the shirodkar. I'm not sure what the difference is between the 2 of them to be honest, but I know it's typically placed higher. It can be removed for normal labor. It goes up the vagina too.
Then there's the TAC which they can place during pregnancy or before. The latest I've heard of it being placed was 16 weeks though and it can't be an emergency type of situation. I've heard it can be done laparoscopically, but I've heard mixed reviews about that.
If you want to get the process started before your next pregnancy, the best thing to do is set up a pre-pregnancy consult with a high risk dr. I personally dilate on the early side. Last time I dilated at 12 weeks (which they think was really 10 to 11ish weeks because ds3 had preemie issues when he was born). Anyway, i was dilated 2 or 3 cm's by the time my cerclage was placed at 12.5weeks and my pregnancy was fine. Obviously if you can avoid doing it that way, I would.. lol I had never dilated that early before though.