Hi. It really does depend on the reason you went into premature labour in the first place.
There is this huge debate about whether which comes first, infection or labour. Sometimes, an infection can be brewing for weeks before it works its way upwards to the cervix and begin to stimulate labour.
Uterine size in atwin pregnancy can trigger early labour, but there are many women who have large babies and go to term. Mine were 3-4Ibs at 28wks - it concerns me, but then I've read many stories of ladies giving birth to 8Ib twins at 36wks, so it isn't a definitive reason.
I personally had a term baby and then went on to deliver at 24wks due to IC. This was specifically linked to cervical tearing during my son's traumatic birth. Fortunately a cervical cerclage has helped me to hold on to this pregnancy, but it cannot stop preterm labour which is a seperate problem.
In some women, prostaglandins kick in too early and trigger preterm labour - no one knows why this happens. There isn't alot that can be done to prevent this, but there is a suggestion that treating with progesterone in the second trimester can prevent this.
In your case hun, you seemed to have a really nasty infection. Though no one can know for sure, this could have thinned or effaced the cervix. In which case you were unlucky, and there is every chance a future pregnancy would go to term.
Even if the weight of your uterus triggered labour in your particular case, this can happen in a twin pregnancy and wouldn't necessarily happen with a singleton. The babies also release the prostaglandins which stimulate labour, so maybe having 2 on board did this to you - why this happens in some women and not others is not known.
A cervical cerclage cannot prevent preterm labour, it can only stop the cervix opening due to the weight of the baby - if this wasn't your problem, then it would be redundant. If IC was your problem you would have had the babies much earlier (usually before 26wks).
I'm sure a future pregnancy would be fine for you hun. The chances are a combination of twins and infection contributed to your preterm birth - 2 things which are easily avoided in a future pregnancy x