TTC for second baby

Hubby and I are ttc our second/last baby. He says he’s all in and is excited. But two months in a row he’s either been tired or distracted and we haven’t had sex on peak fertility days. He says it’s not on purpose but it’s so frustrating and honestly so sad as I am 36 and feel like I’m running out of time. I’ve explained how it all works and why those days are key. am I being dramatic? It just feels like I’m way more invested than he is. 😢