20 weeks

🍑 Peaches Mom 🌻 • Exclusive pumper - going 7 months strong 💪🏽 All i do is pump pump pump no matter what 🎶 I do a thing called , what I want
I am 20 weeks . I have an appt for the gyn tmro and was told I would be have a " long sonogram" that lasted about 30mins . Does anyone know what type of sono this would possibly be ?