You might not get another.
You only get 2 ultrasound altogether but if Theres any complications your doctor will let you know.
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
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.
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