What happens to one person might not happen to another. The creation of an individual is an event that cannot be easily replicated. It will have to do with the state of your body, your genetics, the father's genetics, and things I am not educated enough to list.
Quit for yourself and your baby, or quit for your baby, and then yourself. Your child's life inside your womb is delicate, but your child's life outside your womb will also be frail, and needful for the attentions of sober mother.
I don't think it will accomplish anything to judge you on any faults, but PLEASE let your children and your family judge you on your virtues. Be strong enough to do the right thing for your children. Don't look at a statistic and cross your fingers. Just do everything within your power to give your children the best possible chance. Love isn't a word. Love is a feeling manifested in actions like these.