Hi, I'm really sorry for your loss. I'm in a similar situation, although the baby is larger. Anything over 3cm they recommend an ERPC, which I am having in the next day or so.
I've miscarried naturally at 11 weeks, although never had a scan so I have no idea how big everything was. It was quite painful and I had no idea what to expect so I was a bit scared as well. I had period like cramps for a couple of days which became more intense. Presumably this was my cervix dialating? I passed lots of small clots and then finally one large clot which my body 'pushed' out into the loo, and to be honest, I didn't look to see what it was! I have no idea if this is the same for everyone, I can only give my experience. It was a bank holiday so the EPU was closed so I was not able to be offered anything until it was too late.
I miscarried again at 7 weeks and was offered and accepted an ERPC which I found much easier and less upsetting, although it does mean a day in hospital. This is under general anesthetic, in theatre. It was better for me as it gave me more certainty and control which appeals to me as a person. Recovery was really good from this.
Are they offering an ERPC? I think you can see from my experience that my preference is to opt for one, but it's worth talking through with your EPU.
On a further note, in between the first two miscarriages and this one, I had my DS 1 who is 2.5 and lovely. I wouldn't change a thing now, as I wouldn't have him if either of the first two pregnancies were successful. I'm not sure if you have children (via c-section hence no dialation) but I just wanted to offer some hope for the future. Good luck xx