I had this first time at 41 weeks and it did work. I realise that it generally only works if the cervix is ripe and ready anyway, but wondered if 40 weeks was ok to have it??? If I ask my GP at 40 weeks, she will do it as she is very easy going (don;t have a m/w), but I want to be sure I'm doing the right thing! I have been offered one at 41 weeks but am booked for induction the next day, so doesn;t give it much chance to work really!