Hey Sunny - in an ideal world it is always better to have atleast some length of closed cervix between baby and the outside, not least because its indicative of a cervix which is being maintained enough by the stitch to get you to term or thereabouts. That said, While ever the stitch is in place and remains such with no dilation through it, then theoretically it's working and I have seen many women with zero cervix and a stitch stagger on like that to term.
The main issue you have is not a mechanical one (the stitch is taking care of that), but rather a physiological one in that significant dilation does increase your chance of going into labour early purely because cervical changes are thought to play some part in triggering labour. Again tho, some women just don't labour even with a hugely dilated and short cervix so there really is no way of knowing - this can work in your favour and means effectively that all hope is not lost. Because you arent experiencing bleeding or contractions I would say there is a chance you are one of those women who just might surprise everyone and make it weeks longer with no cervix and effectively the stitch holding baby in.
There was a woman a few yrs back who had no cervix at all, a stitch alone keeping it together and she worked shifts in a bar (8hrs a day on her feet), right up until 39wks! She had to work because she was a single mum with a 2yr old to support. She was proof that the stitch can work honey so please don't assume that this is over just yet (Jees if I had a pound for every time I've said that then seen women like you make it to term

) Lots of love, thoughts with you xxx