Use your desire for motherhood to inspire and motivate you to make a strong career for yourself, so you will be able to give your child the best care.
I had my children long before I was financially prepared, and it's been a terrible struggle. Once, when my daughter was hospitalized, I wanted to cry because I couldn't afford to have the TV turned on and all she wanted was to watch Sesame Street. I can't afford to give her braces now, and she needs them. Not being able to give your child--who you will love more than anyone in the world--what you feel they need is the most heartbreaking feeling in the world. Don't let it happen to you.
And while you're at it, make sure you give them a good and worthy father, too. Sharing your beloved children with someone who doesn't share your values, encourages them to be selfish, entitled, and less than they could be, is as heartbreaking as the other. I can't even IMAGINE the horror of a loving parent who has to share rearing of a child with an abuser, and it does happen (you can't always identify the abusers right away).