low amniotic fluid?

Alex • Baby girl on the way! 💓
I'm 36 weeks today and went to see my midwife, he checked my stomach and said I'm measuring at 32 weeks. I was a little confused cause with my gp has said everything is fine. I told him I had a 34 week ultrasound and it said I was measuring a week and a half bigger! 
He looked into the last ultrasound and said that my amniotic fluid was quite low for how many weeks I was meant to be. I now have to get an ultrasound tomorrow to do another check up. Has this happened to anyone before? I'm not worrying too much about it and I'm glad they arnt taking any Risks, but I just wanted to know if this has happened to anyone else! 😊