Fundal Height- measuring small

LW39
Had my 29 week midwife appointment last week and my uterus was measuring at 28cm. So a cm under but the midwife wasn't concerned and said there are lots of variables. 
Today my GP measured and at 30 weeks I'm still measuring as 28cm, so now am 2cm small. My GP has now referred me for a growth scan. 
Has this happened to anyone? Or does anyone have any information that might make me feel better. 
I'm sure it's not a concern but naturally I'm concerned and just hoping I don't have a long wait for the scan!!! 

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