Thanks folks, baby is still definintely alive and kicking so I'm thinking if there is a rupture, then its likely to be just one or more of the external layers. At my last appt I told him about this searing pain I've been getting at one end of the scar and he said it was just muscles stretching, but it is completely different from anything I felt in my first pregnancy. I just spent a terrifying hour online reading cases of uterine rupture - horrific stuff. Will see how it goes.