blue - I had an early scan due to risk of ectopic so they can definitely do them early. My first scan was at 5 weeks and all I could see was the gestational sac. My second scan I could see a little blob and we heard/saw the heartbeat. Both scans were the external ones too!

I didn't have to pay for either. My GP gave me a referral to an xray & ultrasound place and they bulk billed me. As the other ladies have said, go see a different GP and say you don't know your dates and ask for an ultrasound to be done.