Just tell her that you love her. That is all you can say. To the one who lost her pregnancy, if you are close to her and she knows you knew she was pregnant, tell her you are sorry for her loss. Ask her if there is anything she needs, if she wants company, if you can make a meal for her, if she wants to go out? And let her know that you care about her and you are there for her anytime she needs you. That is all you can do.
No one wants sympathy only compassion. No one wants to hear that you also have tzoris they don’t wish their tzoris on anyone else. And no one knows what they are going through because feelings are personal to each individual.