Low fluid

I had a growth scan today. I'm 34 weeks 2 days and my baby measured in at 37 weeks at 6 lbs 12 oz 😳. My doctor told me to cut back on carbs some to slow his growth. Anyway, they also measured my fluid. It was 7.5. My doctor almost put me on bed rest today 😔 I have to get fluid checks twice a week now starting Tuesday. She said she will put me on bed rest if things don't get better. Has anyone had this happen? What happened? Did your fluid go up?