I am 18 weeks and have my 16 week appointment booked in for today. It was the first one I could get. I booked it weeks and weeks ago and knew at the time that it fell between night shifts and knew it wasn't a great idea but it was the only one I could get. So here I am absolutely exhausted and wondering if I should cancel? I have my scan in two weeks where my blood pressure and urine will be checked so do I REALLY need to go to this one? They don't do anything other than that do they?