Had an early scan... worried

I had a scan at 7 weeks 6 days and this is the picture. To me the sac looks a funny shape? The ultrasound technician didn't say anything and we could see the heartbeat although she didn't say what the rate was. I've had a missed miscarriage before and I have no symptoms this time round and I'm scared to death of another one :( I am now 10 weeks 5 days and don't have my next scan until the 2nd Jan. Anyone have any advice on no symptoms or anything to say about the shape of the sac?