At 20 weeks, we will be going for detailed scan. Is it possible for us to not know the gender during the scan?

In many cases, 20 weeks, the genital can be clearly seen unless the position of the baby not allwing it to be seen. But if it is a boy, most probably, you can see his bird but for girl, quite difficult but i am sure, doctor can see it even we dont. 😁😁