Woman with male harem/reverse harem
 
Angie thought she’d lost the chance to save her baby--until Pluto leapt from the alien craft and rescued both of them.
 
Angie didn’t actually have time to consider what might come after--because she hadn’t expected there to be an after.  But she discovered when she woke up in a hospital that she was on the Ark--headed to an unknown future.  And she had been assigned to Pluto’s quad--Janus, Saturn, and Jupiter--for protection and mentoring until she and her baby could be assimilated into the colony.