I'm sorry you're worried, dear! Although I can totally relate to the worrying. I've heard very good things about cerclage treatment. I bet you're gonna hold out better than you think, with tha. I was also going to say that if you can just hold on a few more weeks, the babies chances of survival will be much better. Also I read somewhere that multiples do better when born prematurely (for some reason.) Follow your doctors orders,,, and I will pray that your little buns keep on cooking for a very long time. =)
Take care of yourself!!! I was put on strict bed rest at 28 weeks with my twins. Stay on your left side and off of your back. Allow yourself to be waited on hand and foot. It will be tough but just think, after the triplets are here, you will never rest again! HA!
Keep us posted on your progress.