Is a miscarriage imminent?

Hi fellow mummies, I am at week 6 and last week HCG already hit 2K. Went for first today scan and the gynae couldn't see anything conclusive. Brought for a more detailed scan by a senior consultant to rule out ectopic pregnancy. Eventually he did find in the womb something which may be a delayed gestational sac. Which isn't a positive sign anyway. Just want to ask, has anyone had high hcg but can't see a sac yet proceed to have a successful birth eventually? I feel like I need to prepare myself for a miscarriage.😢