Tell your Dr. ASAP. Could be inner ear, could be food fermenting in your digestive tract since digestion slows during pregnancy...very rare but there are people who when the eat wheat, they get drunk because thier gut ferments the food
I have had those days as well as days feeling like I have a hang over. I have tried anything to make the feeling go away but have but found a cure for this yet.
There were plenty of times I felt drunk.
Could be an inner ear thing... are you stuffed up at all?