So sorry you're going through this.
I know it is hard to believe firstly that it can happen and secondly that you have every symptom of pregnancy, yet no baby in there. It's a cruel thing. One positive- they do say it is very rare to have it occur twice.

I had a d&c on 30 January for a blighted ovum. I chose the d&c as I carried 2 weeks post diagnosis with no natural miscarriage. D&c was pain free and over quickly.