Along with cutting off time travel, Hope was told by the beings that she would have the body of a normal 30 year old and she would age normally. So would her husband Jost. The implications of this statement didn't occur to her right off, but she soon was faced with the problems of a "normal" woman of that age. It never occurred to her she needed to take precautions.
What an interesting problem Hope had to deal with! She couldn't accept her new lot, it was not something she wished to do. Jost was no happier with the little problem than Hope, at first. With most everything, little problems become big problems. Hope got to stay with her love, but at a price.