Hey!!

At 20 weeks, he will check the babys heartrate, measure fundal height, check your blood pressure, possibly write you out some pathology scrips for the 28 gluclose challenge/iron levels/GBS etc..
If you have already had your 18-20 week scan, he will discuss results with you..
Talk to you about any questions, or concerns you might have...
If you havent already booked into a hospital, that will proberly be done too..

Its all pretty standard.