Bump measuring small but average baby?

Just wondering if anyone else has had this. At my 28 week antenatal appointment, my midwife measured my bump and was worried about how small I was measuring (25cm). It was so low on the growth chart that she immediately referred me for a scan.

Everything was fine at the scan and she was measuring completely average (actually a little big!), I was absolutely terrified that something was wrong though! Then ultrasound technician basically said she thinks its not the best way to measure growth as everyone grows differently.

I can't help but worry about my next appointment next week though and being measured again. Bump feels a lot bigger a couple of weeks later. Has this happened to anyone else? Did you suddenly balloon up in the last few weeks?

Not that I kind having extra scans but I'm hoping they'll not keep scaring me. Grow bump grow!