Motherhood is a great responsibility, and you don't have to give birth to a child to be a mother. Women enter motherhood in so many ways. One thing I can tell you is that your life will change because children need so much of everything you have. It does not matter whether you are a stay at home mother or if you work outside the home, it's still a 24/7 responsibility.
Once your feet hit the floor in the mornings, your job begins.
It's a great feeling watching your children grow into adults and to know you did a good job raising them. So to all the good mothers out there, I congratulate you and God bless.