Just been for my 34 week midwife appointment. She has referred me for a growth scan as measurement has dropped. (At 28 weeks I measured 29 and at 31 weeks I measured 32 today I'm 34+1 and measure 34) she has got me an app today for the scan at 4.30. I feel really nervous about it what could be the reason for the drop ? Will it just be a quick scan then home ? This is baby number 3 but never had this before. Everything else at midwife was fine.