I'm so sorry you're going through this. I have my fingers crossed for the best for you (I bled with clots at around six weeks and she's six now) but you know your body best.
It's my local hospital (well, until Thursday, but it has been for the last 8 years!) and I've had two first trimester losses and I bleed a lot too in pregnancy so I'm quite familiar with the EPU there.
First off, they're very nice.. well, the nurse practitioners are anyway. The sonographers are a mixed bunch, same as anywhere really. Some are lovely, others are more clinical and emotionless which is sometimes what you want, sometimes not. The sonographer will NOT diagnose anything. Usually what happens is they call in a doctor, and it's then you know it's bad news. Some sonographers don't let you see the screen until they've determined what is what either, or even not at all if it's not good although I think they probably would if you asked.
Sometimes they don't call the doctor in but they don't tell you what they've seen, and you have to wait to be seen shortly afterwards by the nurse practitioner. You have a fair idea what the news will be by the position of the box of tissues on her desk.. near "your" chair or neatly back with her pens and stuff (this part always brought a bit of dark humour for me during a miserable time!) Although by that point if the sonographer hasn't shown you anything you'd probably be fairly sure anyway.
It'll be dildo cam at some point, yep.
It's totally fine to bring your DH - they are very welcoming.
You can ask them for a free scan photo if you want to as well.. unlike the later on scans, they don't charge for these, but they don't offer them either unless you ask. Some will, some won't, and of course there a) may not be anything to see and b) you may not want one either.
Get there as early as possible, maybe even 15-30 minutes before they officially open, so you're near the top of the queue. If you arrive when they officially open you'll find you're about sixth or something and could be there for hours.
You won't get an appointment for an ERPC same day. If they deem one necessary, at the earliest they will book you in the next day so long as they have availability but they generally have I think.
I hope you get some surprisingly happy news tomorrow, but if not, I hope they treat you okay and you get a nice sonographer! The trust may be bankrupt but it's business as usual up there.