The House Called Edenhythe by Nancy Buckingham

Newly windowed and penniless, young Rachel Harwood reluctantly returns to London from her beloved Sarawei to stay with the ship-owning family of her husband, who all treated him so unjustly. It is only because she is pregnant that she can accept their charity. But Rachel's pregnancy upset the family—and caused someone to want to kill her... Romantic Suspense/Gothic by Nancy Buckingham; originally published by Robert Hale [UK]