Just been diagnised with a Subchorionic haematoma

So i had my first scan at 6w2d and the little bean was beating away. However i received a call from my doc yesterday to say she only just received the report and i have a small Subchorionic haematoma and have to have another scan to make sure it hasn't gotten any bigger. I'll be 9w1d when i get my scan so hubby and I are looking forward to seeing our little bean again and hopefully hearing the heartbeat but im concerned that the haematoma may have gotten bigger. Has anyone else experienced this? Did your pregnancy progress normal? They said it can happen in 3% of pregnancies and if it gets too big it can lead to miscarriage. :-(