The Question and Answer section for The Color Purple is a great resource to ask questions, find answers, and discuss the novel.
At the start of the novel, the young, black female is presented as about the most vulnerable person in society. Celie epitomizes this female: she is abused and denied a voice by her (supposed) father and then by her husband....
Celie is referring to the fact that she is pregnant.
B. Celie's father means he will have sex with Celie.