You only get 2 ultrasound altogether but if Theres any complications your doctor will let you know.
You might not get another.
With my first pregnancy I only would have had one ultrasound and that was to find out the gender at 20 weeks but then as I got farther along they wanted a growth chart because they were estimating my baby to be 6 pounds at 32 weeks. I am now pregnant with baby number 2 and I had an ultrasound at 9 weeks to confirm my due date and I will have another between 16-20 weeks
Every pregnancy and every doctor is different. My first pregnancy I got about 6 of them. 1 to confirm my pregnancy 1 to find out the gender and the anatomy, had to go back in not long after that because my daughter was hiding her head in my pelvic bone, than back a couple of more times because my cervix was shrinking, than my last one I asked if I could have another to get a 3D picture (they wrote it off as a medical reason). For this pregnancy I have already gone 5 times and I am only 19 weeks along. I will be doing 2 more in the next month. I might have to go a couple of more because I think they want to keep an eye on the umbilical cord.
I've had 3 so far. One at 6 weeks to determine due date. One at 16 weeks because I opted to find out earlier her gender. Then her 20 week anatomy scan. I'm pretty sure I get another one around 32 weeks to see her growth and if she moved out of breech position. Just depends on the pregnancy and your doctor