I have a permanent abdominal stitch in due to incompetent cervix. I'm 34 weeks today and have been having a lot of contractions recently and had PTL at around this time with DC2 despite a regular stitch. Due to my transabdominal stitch, I need a c-section as there's no other way out for baby, and leaving it too long could eventually cause uterine rupture.
I saw my consultant today and she said not to bother even ringing unless I was having 3 contractions in 10 minutes at least a minute long. That's 18 an hour
Even then she said they'd tell me to hold on for a while and see if they went on their own. Errr. Fair enough post 37 weeks, but at 34 weeks??
She's not my stitch doctor, and probably knows little about the one I have, but stitches aside - before 37 weeks surely 18 an hour is leaving it a little late for anyone, ELCS requirement or not?? 
Needless to say I'm not going to leave it that long if I feel I need to go in, but I'm curious as to what others have been told for pre 37 week labour.