When is the best time to get a sonogram?
I believe this depends on your doctor. With my first couple I had ultrasounds at 20 weeks. That was standard "back then". With my oldest I had a late sonogram because they were worried baby was too big to deliver.
After my miscarriages, I would get an early ultrasound just to see how the pregnancy was progressing from the get-go.
I didn't have an ultrasound with my last three babies.
With my son I had the 20 week one and then towards the end they did more because of my past history of having low amniotic fluid. It was low with him too, but not dangerously so, they just kept an eye on it.