Baby's gender

I did NIPT (since my FTS is high risk) and found out that it can also show the baby's gender. Am excited but not prepared as always thought will know only after 21 wks during the ultrasound. I am planning to do a gender reveal party so do u think is ok if i tell the gynae that i do not want to know the gender yet? (Since my main priority is the downsyndrome result). Will they still gv us the slip of paper of the gender for us to keep? Abit paiseh want ask dr to not reveal :D