Went for scan today. The scan is 5w+ i supposed at the 8 w+ now. Anyone have same experience?

Hey yes me. I conceived via IUI and was supposed to be at 7 weeks based on counting of last period. I did a scan last week and detected heartbeat for the first time, baby measuring at 6 weeks. My doctor is not worried about it so as long as the next few scans are developing correctly it should be fine!