Trigger warning!!

So I am 8 weeks and 4 days. Went for a scan last week at 7 weeks and 4 days and all they found was a small gestational sac measuring 5 weeks and 1 day. On Monday I had my hcg checked and it was 13500 which they said was still okay at this stage but then I had another lot of bloods taken yesterday and it was 13000 in absolutely devastated as they told me it's likely that I'm going to miscarry due to levels going down.

Has anyone else had something similar and still had a healthy pregnancy, I now have to wait 2 weeks to get a repeat scan and keep getting hcg tested. But this dosent sound like a good sign , this will be my 3rd miscarriage. Thank you for any insight ladies. Xxx