Growth Scan

Lucy • Hello, I'm 22 already have 2 children aged 2 and 3 and just found out I'm expecting again with my 3rd due 24th October!
Currently 38+4 weeks pregnant and went for my 38 week midwife appointment today  and been scheduled in for a growth scan tomorrow. All the way through the pregnancy she has measured just below the 50th centile line but today she measures around the 20th. Anyone else had growth scans?