mid pregnancy ultrasound...

jenweber03

I am having my "big" ultrasound appointment tomorrow and was just wondering if I had it scheduled too early... my doctor said to schedule at 19 weeks and I wasnt really paying attention when i told the secretary 4 weeks from my last appt.... I will be 18 and a half... do you think it matters that much if it is by a couple days?  When is your  anatomy ultrasound scheduled???