3D ultrasound at 33wks....

Kitty • Living with PCOS. Mom of THREE boys Jayden💙Ethan💙 Logan💙
So I called my local 3D sonogram place and was told that I need to call at least two weeks in advance for an appointment. So I decided at 33wks I would do so. Today I am officially 31wks. So I call and the lady tells me that if I do it at 33wks it's harder to see the baby, which I thought was the opposite. Now I'm confused. So do I do it now, or do it at 33wks?