8 weeks measuring 5 barely! Is this a blighted ovum?

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So I’m 8 weeks by lmp but went for scan yesterday and was told I’m barely measuring 5. No baby just gestational sac and yolk sac. The thing is my hcg is more than 8200 which has me on track with 8 weeks. Did my baby just stop growing or is there still a chance it was just too early. I’m freaking out has anyone else experienced this?!