A small perigestational collection with a good choriodecidual reaction and no subchorionic bleed is actually a reassuring combination at 8 weeks. This pattern is seen fairly often in early pregnancy and usually resolves on its own as the pregnancy progresses. Given your history of two earlier miscarriages, it's natural to feel anxious. But these specific findings don't point toward a miscarriage in progress.
Next Steps
Continue your prenatal supplements as advised and avoid heavy lifting or strenuous activity for now. Get a repeat scan in 1 to 2 weeks and discuss this with your obstetrician, who can track how the collection is resolving.
Health Tips
Contact your obstetrician right away if you notice bleeding, clots, or cramping pain that doesn't settle with rest.