I thought I was paying attention to the technical bit at nct but clearly not....
wk 39 and although I've had crampy pains and lots of BH in the last week I didn't think I'd lost my plug. At the hospital today the Dr said my cervix was favourable and open enough to do a sweep which he did.
So if my cervix is already open does that mean I've lost my plug and I just didn't notice? 
nb for anyone worrying about sweeps I really didn't think it was that bad at all. No worse than a smear. Poor DH was more uncomfortable than me
not that he was watching but he could obviously hear through the curtain and he has a fertile and squeamish imagination!