I got mine done at 16 weeks and i found out i was having a girl
I would wait a lil longer....maybe after 20 wks. I had mine at 24wks and baby features were beautiful. It will be worth the wait! :)
You can get a 4d ultra sound by 18 weeks I think. I got my 1st ultra sound at 14 weeks vaginally, but ur far enough u should be fine to get it.