Just that really. I know the cervix is cranked open to insert the coil but wasn't sure if that was classed as surgery. Was reading a separate thread about cerclage and didn't want to jump on there with my random questions but was wondering why a doctor would recommend a scan to measure the cervix? Looked it up online and read that one reason is when previous cervical surgery has occurred. I've had a coil fitted in the past but didn't tell the midwife during my booking in appointment as I didn't think of it as surgery. Should I have? Now worrying about cervical incompetence is something I've added to the list of things keeping me awake at night (currently 18 weeks, first pregnancy). Any opinions would be appreciated.