FWIW my dating scan with DD was out by about 5 or 6 days. I was given an EDD of the 28th of August when I calculated I was due around the 22nd of August (based on when I thought I O'd). The 20 week scan gave her an EDD of the 22nd like I thought it should. She was born on the 24th .

Sorry you are feeling a bit worried . I hope you get to see a nice healthy heartbeat next time.