Catching up...
panic, great news about harmony! I hope the placenta thing is alright. Cvs testing is very safe, and has a far lower risk of miscarriage than most people think. Apparently it's more like 1 in 800, not 200! And are you happy to have the EDD as your birthday? Mine is 4 days before my birthday and I REALLY don't want it arriving on the same day, but not sure why...
And re all the headaches, do you know what your blood pressure is like? Aren't headaches a possible sign of high blood pressure? I can't be bothered to google it, but might be something.
And as for the 16-wk appt, I had mine yesterday. I think it varies region to region what they do, but some things must be standard. They should give you results from the blood taken at booking in (but mine weren't back yet, 5 weeks later!), take blood pressure and check your wee for something. I'm not sure, but maybe for protein, which might be a sign of pre eclampsia? Mine used a Doppler to listen to the heartbeat, but I've heard that some don't do it at 16-wks anymore, because it can be difficult to find. I heard mine, though, and it was 155bpm!