Sonogram???

Jasmine • 26 💗 happily taken by my love of 3 years💍 mommy to veya 👶🏽❤️

I havnt had a sonogram since 7 weeks I’m 15 now I want to see my baby!!! My doctor said we had to wait until 18 to 20 weeks I’ll be 17 when I go back any chance they might do it then? This is my first baby and third appointment. What usually happens at the third appointment?