Demon Discord by M.J. Haag

All Terri ever wanted was a family of her own. Then, her world fell apart in more ways than one. Hellhounds, infected, and food shortages became her primary concern and would have made pregnancy difficult, but not impossible. Until her husband divorces her in a fit of hurt feelings.
Now, she has a choice to make. She can linger in the same house with a man filled with bitter resentment…or find someone in the other survivor settlement to take her in. Someone not human.
The thought of living with a fey makes Terri want to faint with fear, but maybe there’s a silver lining. The fey want babies just as badly as she does.
Starting over isn’t easy. But it might be exactly what she needs.