"And for us, I thought, but could not say it; for at the beginning I had not wished my husband to know that I was putting myself in the hands of a foreigner, for I knew not what his reaction would be. I had consoled myself that it would be time enough to tell him if a child was born; and now I found I could not do it, because he would surely ask why I had not told him before. . . . What harm, I thought, if he does not know; I have not lied to him, there has just been this silence."
From the above paragraph -- what has Rukmani done that she is scared to tell Nathan?