How do I handle this situation?

My husband and I have been married and ttc for a year (1st off, if anyone has tips, please sound off in the comments).

I just got a phone call from my sister who got married in November that she's pregnant (4-8 weeks). I'm not at the point where I'm jealous or upset that I've been trying longer than her and she got pregnant first.

But my husband is. I left the room after having a discussion with him, because my brother called. When I got back in the room, my husband was sobbing. I know this is important to him, but I also know it can take a little bit to become pregnant.

He said he's sincerely happy for her, but that it's unfair that we've been trying longer.

I already told him all of the typical things, like things we need to work on, the fact that my sister and I are separate people and that it may take different lengths of time. I think he's afraid he's not good enough. He also has history of depression which had caused his libido to be low, but we're still trying despite that. Does anyone have any suggestions on how we should handle this?