ChovieGirl- I've been constipated pretty much throughout my whole pregnancy, and found out that figs and kiwi fruit do the trick. Kiwis are notorious for sending you to the loo, give them a shot. They work far better than anything you'll get from the chemist's.
yellowyamyam-hi, hon. I know nothing of transabdominal cerclages,
Lizzie may know more, but here are my thoughts on this. In my understanding, elective cerclages are usually placed between week 13 and 17. Before week 13, the chance of m/c is still higher compared to the other trimesters, and so they will not stitch you up in case it causes more problems than it solves. Sounds like that was the case for you, and I'm really sorry for your loss, hon.
Without being an expert, and without knowing much about your case, sounds like a normal TVC can help you. Monitoring your cervix is a great idea, but I would push for an elective cerclage early on if your consultant is resistant, before 16 weeks.
Lizzie will be able to help you a lot more than me on this one though. My layman suggestion is to listen to him and stick to the scans but push for a cerclage before 16 weeks if there's the slightest worry. It's far better to have an elective cerclage than an emergency one, and he should not take any chances.