Scan dates V's Dr dates

Bi
Just had a scan saw the little muppet his/her heartbeat was 114 they told me I was very early and not to be concerned. 
Dr has his dates wrong like I have been saying for a few weeks my new due date going by the scan is 15/2/17 so I'm 5 weeks 6 days. 
Feels better to know for sure and to see that little heart beat😊