My Dr did ultrasounds around 7 weeks, 12 weeks, 15 weeks, 20 weeks and i had a free 3d/4d session at 31 weeks.
You may not get another one.
I had one in the er at 8 weeks then a viability scan at my doc at 9 weeks then another scan at 12 weeks then another at 20 weeks. I also paid for one at an independent place at 19 weeks and I'll be paying for another at 31 weeks.
Was it an anatomy scan? Because they usually do an anatomy scan at 20 weeks for size and gender to make sure baby is growing correctly. Ask your doctor maybe its different where you're from
I have one at 12 and one at 19.. I'm 35w4days and won't have one unless baby is at risk.