Share 'Ultrasound reliability, low amniotic fluid'

I have a couple questions I would like to ask everyone based on their experiences and expertise. My 1st one is, how reliable is an ultrasound when it comes to amniotic fluid levels? Heres why I ask... when I was around 38 weeks pregnant my midwife sent me to get an AFI ultrasound because I was measuring small, she thought my fluid might be low. I measured 8 cm. Then at my 40 week apt I was stil…