Gender based on face in 3d ultrasound

I'm 30 weeks and we are team green!! Just recently had a 3d ultrasound and my MIL insists that the baby is a boy and refers to them as he. I feel like the baby resembles my husband a lot as well but it is frustrating when she does that. We just want a healthy baby and have done really well this whole time not referring to them as one gender or the other.