Low Fluids ..Help!!

Nicole • Hey,I`m a 29 year old teacher and this is my first child .. I`m excited and nervous at the same time.Any advice is great
So I went to the doctor today because I was afraid that baby was in distress ..so they had me on a monitor for like 30 mins to check her heart rate and movements ..everything turned out fine but then I went in for sono right after and they said she looks fine but my fluid is very low ..she said I need more fluid intake !! By the way in 26 weeks ..this happened to anyone else ?