The Familiars by Stacey Halls
Fleetwood Shuttleworth is 17 years old, married and pregnant. As the mistress at Gawthorpe Hall, she is expected to produce an heir, but this is her fourth pregnancy and she has no living child. When Fleetwood finds a letter she was never supposed to read, she discovers that the doctor does not believe that she will survive another pregnancy. By chance, she crosses paths with a young midwife by the name Alice Gray who assures her that she can see Fleetwood through the pregnancy and that both mother and child will survive. But Alice is accused of being a witch, and now both their lives are at stake. Only they can save each other.