Do you need to hold in your urine when doing a B-ultrasound in early pregnancy: 1. \”B-ultrasound in early pregnancy: Why do you need to hold in your urine? This article will tell you the answer!\”: Doing B-ultrasound in early pregnancy: Why do you need to hold in your urine? One article tells you the answer! In early pregnancy, doctors usually recommend pregnant women to have a B-ultrasound examination. This is common