Oh...let me tell you about too much fluid. I had insane amounts of fluid. My Dr. had never seen that much...seriously. I saw a high risk doc and got monitored 3 times a week from 17 weeks, until he was born. He always looked great. He had no complications. I never had gestational diabetes. One problem, is that he was swimming in there. I had so much fluid, that he never was restricted or forced head down. I had to have a c-section. They were also worried about a prolapsed cord, with vaginal delivery....because I had so much fluid. There were some other things wrong, too...but they didn't have to do with all the fluid. When they did the c-section I heard a massive crash of fluid. They surgical tech was like, "My god, that's a lot of fluid!!) Apparently, it went all over everything, because there weren't enough buckets. I had so much fluid I walked out of the hospital having lost 28 pounds. (I gained 35!!)
He was perfectly healthy, and still is. You are far along enough, that they really should be able to detect something wrong. If a high risk OB tells you the baby looks good, then the baby is good! They deal with babies who aren't good all the time, and they are so relieved to look at one that looks great. (That's what my high risk OB told me, anyway.) Relax. You and baby will be fine!! If MY baby was fine, with the ocean that was inside my belly...your baby has an even greater chance!!