It doesn’t mean that your child will have a birth defect. Your dream reminded me of the birth of Esau and Jacob. It just means that you are going to have a struggle spiritually with one of your children more than the other. You will just need to love that child more to get them to where they need to be.
I’m curious if your ultrasound shows twins.
If it does not show twins then your dream is about another type of birth which can be the birth of a business or ministry.
Keep us posted.
God bless you, your marriage, your pregnancy and your ministry.