Doc says 9 weeks, scan says 6?

Hi
I've had a small amount of bleeding (brown) for a couple of days so went for a scan this morning.
I'm supposed to be 9 weeks but was told from the scan that it looked like 6 weeks.
After seeing the EPAU nurse I feel like I was being prepared for the worst.
Have to go back for another scan to check for growth in a weeks time, unless something happens in between.
Feel devastated
nx