Taking mother with you to appts?

Jennifer • Mama to a sweet 3 year old girl. Ready to make her a big sister!
Im currently 11 weeks and today my mom made a comment about her going with me to see the ultrasound. DH makes his own schedule at work and will be at all appts with me. According to our dr, I will only have one more ultrasound around 20 weeks (unless they feel something is wrong with baby). I really want just my husband and I to be there when we find out the sex. I know my mom means well but idk what to do/tell her. Any suggestions?