Does anyone know anything about this? or had this happend to them in thier pregnancy?

2 days ago I went for a early pregnancy scan due to a gush of blood I had last week, the blood was a pinky colour and lasted two days, then went brown and stayed brown until yesterday its stopped completley, at the scan the sonographer seemed pretty convinced I was carrying twins as there was a large area seen attached to a sac wich had a baby in it. The baby was fine had a heart beat and seemed ok. She even said sorry I think you were having twins but lost one. After my scan I seen a nurse and she said it could be twins but she thinks its more likley to be a bleed. The area measured 5.9 cm x 3.9cm, its written down that the baby measures 5cm, but they also wrote this.... Adjacent to the right of the sac lifting the chorionic plate was a large hypoechoic area, isoechoic debris was identified within the hypoechoic area and ultrasound appearances are suggestive of a relatively large subchorionic haematoma but no other abnormalities identified. Does anyone no what that mean? I have no idea one minute I'm being told I was carrying twins but lost one and the next I'm told its a area of bleeding, I'm really confused and worried! The nurse who wrote this said it could be twins but it could be a bleed, I hate sitting here wondering wether I have actually lost a baby or wether its blood its anoying me!!