Blighter ovum

So I should be 8 weeks pregnant by now. I attended a scan last week and they could not see a baby only an empty sac. Came back two days later for repeat bloods. My hcg had risen but 12,000. They rescanned me, transvaginal and normal ultrasound and still nothing. Just an empty gestational sac. They have concluded that it’s not ectopic as they would have spotted it and the fact that I would have bled by now or been in excruciating pain. I have had pain but not that bad.. fast forward to today and I’m back at the hospital. They are satisfied that this is a blighted ovum -failing pregnancy and have scheduled me for a medical mangement of miscarriage on Friday using tablets 😭 I’m so confused and upset and anxious. Has anybody had a similar experience? Please advise 😕