First of all, it's taken me awhile to respond because I've read thoroughly every post since my last one yesterday. Thank you for your replies and I'm very interested in the general thread that was started, will peep over there at some point.
This morning I asked DH to come to the scan and he said he wasn't ready, so I rather huffily said fine I will sort it ll out. I'm a bit pissed with him but I do understand the panic he's going through, but FFS what if I'd said I wasn't ready? Would DSD have had to go by herself? Jesus.
Long story short, she is 15+4.
I found that out and then was asked to leave the room so DSD could talk about her options. She came out absolutely AGES later so I assume she probably broke down in there with sonographer (who was very stern and I'm quite glad of it, to be honest). I decided not to make a huge scene in hospital and we drove home, then I asked her what happened.
I am very angry with hospital and sonographer. Basically they told DD that she is too far along for the 'easy'
abortion and would have to do a surgical procedure, involving (DSD is sobbing her eyes out btw as she tells me this) inserting forceps into her vagina and breaking the 'foetal matter' apart and removing that way.
I don't think I would still have asked DSD to get an abortion at nearly 16 weeks anyway but for them to describe it in such graphic detail to a 14-year-old is over the top, IMO. I think it was total scaremongering, pure and simple. DSD begging me not to make her have an abortion and I've said I won't and neither will her Dad.
Problem 2: She is too far along for them to do the 12-week checks. They have said they can not accurately measure baby's nuchal fold because it's too far into gestation and they will have to do an amnio to check for things like Down's, etc. if we want it. DSD is freaking out about a needle being put into her stomach, we haven't decided anything on that yet but FUCK just one more thing, you know? I hadn't realised young mothers were at higher risk for SN either but thank you whoever put that on the thread, I've done some googling.
DH not home yet but when he is we will all be having a serious sit down conversation. I will make DH sort out the counselling (ace idea whoever mentioned that, I'm terribly sorry I'm not keeping up with anyone's name), make DSD face up to the realities now, and sorry I realise may not be the most popular option but I really want a definitive answer out of her about the father. If she doesn't know who he is, fine but she needs to tell us that at this stage.
I've spent the last hour crying and had a little mini-breakdown of my own, I feel like 16 weeks (nearly) is so bloody real. We hardly have any time to get used to anything.
Feeling v. sorry for myself at the moment. I know it's life, but god. Why me? 
Okay, going to pull myself together and write down some things for the talk tonight, I'll disappear again for awhile but will come back on tonight hopefully or maybe tomorrow morning - I'm very glad that people are interested and want to know how we're doing, it is providing me a link to the world outside our little combustible bubble right now.