Low amniotic fluid

K
On Monday I had to get a follow up scan to see if the baby was growing, today they told me she has grown since the scan two weeks before hand. But now the amniotic fluid has reduced. And I have to get another scan in two weeks. 
I haven't noticed any leaking but then again I don't really know this is my first child so I'm kind of lost and confused. Has anyone else had this before?