Dates wrong?

Ash
I had an early scan today after some bleeding at what I thought was 6+4. Good news is there is a heartbeat but the doc said I'm actually 5+6? I asked her to double check and she didn't seem concerned but I know when I had a positive ovulation test and I don't see how it's possible. Now I'm worried there's something wrong🙁 this happen to anyone? She also refused to tell me the heartbeat and said they don't measure this at this stage but Ive seen others with early scans who had a beats per minute.