Will they intervene

So I’m 35+4 weeks pregnant. And at my last antenatal check up they were worried about baby girl being small or not growing so they sent me for a growth scan.

That scan came back saying she was perfectly fine and said I won’t need another scan as she’s fine.

Two weeks later I had another antenatal check up and they are sending me for another growth scan tomorrow because she’s small/not growing again.

Why did they say I won’t need another scan and now they are sending me for one? Will they do anything about this or just keep sending me for scans every time I have a check up?