I have been there. When my wife lost pregnancy, she was in a great stress. While it was also painful for me, I was able to convince myself that we can try again. However, she couldn't, and she started developing PTSD. Her symptoms were so severe that doctors even asked me to take her to mental health institution. I took a break from my work, I stayed with her, communicated about things she liked, frequently took her for walk, and it helped minimize her symptoms. PTSD was gone when we had out first baby. These days when I remind of her conditions, she laughs.