Husband not as into it as I am?

My husband is 49 and I’m 28. He has two teenage boys (who I am close with) and they were made on the first attempt (each time). Due to our travel schedule my cycle is always crazy, although it’s typically very very regular when not traveling. So when we have a chance to track he gets weird about it. He thinks “it will happen when it happens” and that I’m putting pressure on him. I don’t think I am. I talk to him about my cycle and which days are most important. On those days I make sure to spice it up a bit so it doesn’t feel like a chore. All I get in response is “ugh I’m so tired” “I ate too much I can’t” “I had a couple drinks with the guys i don’t think it can happen”. He knows that this is the ONLY thing in the world I want. He knows my mother has terminal cancer and I’d like to have a baby before she’s gone. Before we even started dating we discussed children because I am not flexible on the topic and we needed to be on the same level before we started anything. He’s come with me to doctors appointments to check my fertility. We have unprotected sex on the regular. Idk, I just can’t be okay with his super laid back approach. I talked to him that yes, it should be fun and loving and happy, but there’s also a scientific approach to it and in working hard for that balance. I feel like I’m doing 200% and he’s doing nothing. Opks, bbts, calendars, apps, not drinking/smoking/less caffeine, prenatals, research, and he can’t even have sex with me when it’s the most important time? (Yet his normal complaint is we don’t do it enough 😂). Anyone else getting this from their SO?