Hello? I want to go for an ultrasound tomorrow to confirm the pregnanc…

Hello? I want to go for an ultrasound tomorrow to confirm the pregnancy and determine the due date. And I'm thinking which type of ultrasound is better, transvaginal ultrasound or transabdominal ultrasound? I'm afraid that after a transvaginal ultrasound, the uterus will start contracting, contractions will begin, and so on.