Thanks so, so much everyone. 
We told our other two DC and my parents and siblings last night, and everyone (especially the DC) were thrilled for us. DD has started suggesting names already (we didn't tell her the gender and we're going to keep it to DH and me) - Tom, Max or Andy for a boy (all good), or Tiana for a girl (hmmm. May need to work on girls' names.)
Seat, hope you're okay. That was quite a shocking scare your little bundle gave you. Looks like some of us are having having babies who like to create a little drama for their poor parents. I hope the bleeding has settled down. I know plenty of women bleed all the way through their pregnancies and have perfectly healthy babies, though that's probably not going to stop you worrying massively every time.
Drama, I'm really sorry to hear you had to go through that with your midwife. I'm not sure how it works in the UK as I've never had a baby there, but can you ask to see someone else? If not, I would make your appointments for the days she's not there. A good midwife is so important. There were two different midwives alternating in the practice I went to with DS, one fabulous, and one not so. Unfortunately, the day I went into early labour with my son, I called up and got Not-So. She told me to go home and rest and come in in the morning....with six weeks to go til my due date and an IUGR baby. I was in the labour ward a few hours later.
Eliza, I'm a big Sheryl Sandberg fan. I loved Lean In. You were absolutely right to say nothing - let us know how the negotiations go.
Belly and everyone else with scans coming up, best of luck with them. One little thing I did yesterday when I was waiting for the lab to ring with cvs results was buy the baby a present, a gold hamsa hand necklace. It's supposed to bring luck and protection. I put it on straight away, and I'm going to wear it until she's here, and then it'll be hers. (I'd have given it to a boy too - even if he didn't want to wear it.)