Couldn't see all heart chambers at 20 week sono on monday. they said its bc i'm 222 pounds. they said come back friday. good chance friday? too soon?

Yes: Repeat sono to see the anatomy just within a week may be too soon.

Maybe: U/S is the exam which is most operator dependent on medicine. The tester has to manipulate the probe outside your body twisting and turning it looking at a grainy monitor screen. You admit you are a rather large lady. Maybe somewhat difficult to turn the probe just right. As the fetus grows structures will get larger and easier to make out. Some fetuses are born with congenital heart disease.