Can I have two people in the room with me for my first ultrasound appointment?

One being my husband and the other being my sister.

I had originally planned on having my sister come with me because my husband was supposed to be out of town, but now last minute he's able to get home in time. I don't want to just be like 'Yo, you don't get to come with now because he's home' since she's already been planning on being there one to go with me.