ultrasound questions

Je
I had a "dating" US at 5 weeks then another one at 6 when they found the HB. I had another US at 11weeks. I declined the nuchal one. I had my 20 week anatomy scan last week. Assuming everything keeps going fine, will I have another US at my OB? Or is it just testing and Doppler until the end? I plan on paying for a 4d one later on anyway but im just curious.