I need advice..

My dear bestfriend told me today that she had lost the baby. She was about 4-5 weeks. Her and her husband have been trying for 3 years. We both were so excited to be pregnant at the same time and we were excited about getting to take pictures together.. I am so heartbroken... I couldn't imagine what they are going through.. I feel like I don't know the right words to say.. what can I say to make her feel better..