What did your OB ever say about you passing out? My OB totally shrugged it off and said it is normal. That it could be low blood sugar, low blood pressure or just the babies sitting funny on some vein. I had my a/s today and about blacked out twice during it. The MFM kinda said the same thing and suggested compression socks (ew! in the summer?!) guessing it could be blood pressure related (but didnt even check my blood pressure)