Kim - always get checked if you have ANY doubts hun. That said, there are many pregnancy symtpoms which are normal, and most women don't even notice. Us IC ladies understandabley tend to micro manage every twinge, imagining it to be a sign of threatened labour or cervical dilation

If nothing but to put you rmind at ease, why not go in? Remember tho hun, I was in tears daily, convinced I was experiencing PTL, and it never came to anything, nor were the symptoms affecting my cervix. Take care x
MA - I am dumbfounded hun. The extreme complications your docs talk about are rare, and virtually unheard of. PTL is a risk for us all, and after having the stitch placed, we all have to be aware for a few days of the slight risk of miscarriage. IF it does happen, the stitch can be removed before any tearing or rupturing. The biggest risk is tearing thru the cervix - this would leave you with lacerations which may compound the IC issue. As soon as preterm labour shows itself, then you get to hospital and the stitch is removed. As Sherri says tho, the stitch usually holds, and the cervix dilates above and below - it rarely tears thru.
I laboured for a week after the emergency stitch went in, I bled and had massive contractions. My daughter even pushed her foot thru the stitch. It still held firm, and had to be cut to deliver her head. There was no damage at all to my cervix - in fact the only damage which had occured happened during the "normal" full term delivery of my large first child. A much more common reason for damaging the cervix.
Damage to the cervix can happen for a myriad of different reasons, but it is rare. Having a cervical stitch placed electively is low down on the list of causes. There is a generally held belief that sutures often don't address the real issues for PTL, and so are a waste of time and resources at best, and at worst increase the threat of complications. I don't share this belief!
In my twin pregnancy, the threat of PTL was high for issues other than my IC, but that doesn't mean dealing with the IC was a waste of time - it eliminated at least one of those risks. Thankfully I had a doc who shared that belief.
I am so sorry you cannot get thru to your clinicians love. They seem resolute that your problems last time did not lie with IC. At this point I guess you have to move forward chick, and try to restore your faith in this pregnancy. Easier said than done I know.
The fortnightly scans are good, they will diagnose any potential issues in time to place a stitch, if it is necessary. After that, I cannot stress enough how valuable resting is - I am certain that's what got me thru to term. Sending you a big hug sweetheart. I know how terrified you are, but I also know that I have been proven wrong when my instincts were telling me I would loose my babies. Despite the stitch I was utterly convinced I wouldn't make it, but did. Keep in touch hun, we are here to help and support xxx