Hubster losing interest?

Megan • Adult/Pediatric Trauma RN., BSN. Family Nurse Practitioner student. Mother to an angel. Baby girl born July 3, 2017.
My husband for the past several months has been so adamant about TTC. Trying to start a family was actually his idea, not mine. After some convincing and dr appointments, we agreed to TTC #1. After a few months of BD and lots of BFNs, he seems to have lost all interest. He still says he wants to have a baby, but he doesn't seem as eager about it. I'm afraid that he's disappointed that I didn't give him a child sooner. I feel as if the subject has become taboo between us. Any advice, ladies? This is so new to me. I'm already stressed because I thought TTC would be easy for us, and well, it's not. How do I get my "eager to be a dad" husband back?