24 week ultrasound what to expect??

So I have my 24 week ultrasound Monday. I am expecting DCDA boys due in May. Just wondering what to expect? Is is a growth scan? I have had two children before and  I'm used to only having a 12 and 20 weeks scan. So far I have had 8 acans already this pregnancy!! Super excited to see them again just anxious hoping they are both okay. Having lots of movement which makes me smile 😊