12 weeks 3 day scan

Meldiony • I have one lil boy & a princess on the way due April 17, 2017 💗👶🏾
Tomorrow I have my 12 week 3 day scan I know it is still extremely early but If I ask the person who is doing the sonogram to Check for gender even tho we might not see anything can she refuse to do it ? It never hurts to try right