Ultrasound?
Answers: It's usually at 20 weeks. They will potential schedule you at your subsequent visit so that you will be around 20 weeks when it is in fact done.
It's so hard to continue for that!
I work for an ob-gyn and I schedule my patients for ultrasounds between 16-21 weeks. Its the best time to see the fetal nouns and heartbeat.
Good Luck!