Thanks all. We opted to find out the sex as they can separate out the dna between the mum and baby from 10 weeks and tell (with a less than 0.5% error rate) which I thought was pretty amazing, in terms of scientific advancement. I live in the US though, so not sure if this feature is offered as part of the harmony package in the UK. We had to tell them up front when they took the blood that we wanted this; knowing US insurance it'll probably rack up the cost another $1000...
Planning to tell my mum on Sunday for a mothers day present as she's in the UK. I think its a marvelous present, my sister might think I'm just being tight in not buying anything
we were basically told we had unexplained fertility so this announcement will come as a big surprise to lots of people!
Kitty; thinking of you and your family today 