I had mine at 20 weeks but Ik plenty of girls who had the 3D or 4d ones at 13 weeks and theirs all came back as the right gender!
I found out at 15 weeks with my son an he stayed a boy an at 16 weeks I found out I was having a girl an she stayed a girl. just depends I guess!
i didnt but know a few gals who have one girl was told at 14 weeks she was having a girl then at her 20 week ultrasound was told she was having a boy for sure and got confirmation again at a later scan i dont remember what week after 20 but i would wait for then or even a bit after i found out at 19w and 6d for this pregnancy and for my daughter whos 5 now 20w 5d
I did with my son. They kept telling me I was having a girl