To have or not to have a Third?!

I just don’t understand. My husband tells me he wants to try for our third, but when it comes time I feel like he isn’t really sure about it. When I tell him I got a positive ovulation test we need to try his response is something like “it doesn’t have to be right now” and when I try to explain to him once my body releases the egg our chances are over for that month he’s like “I know all that don’t just happen in one day. If you can only get pregnant one day out of the month how does it happen to people all the time?” Like he just doesn’t get the science or how the process works?! With our second, we thought it would take a while like it did with our first so we started trying a little earlier and surprisingly got pregnant the first month of trying. I guess I just thought that’s how it would go this time around, but we already missed August and we’ve only had sex twice this time in my fertile window. Once before I ovulated and once on my peak day (the 23rd). I’m just not sure it’s gonna happen again this month and I honestly don’t even know if I wanna keep trying if he’s not going to be as excited as I am. I have it all planned out too. Since this would most likely be our last, I wanted to find out and surprise him in a really special way on his birthday since we have always found out together. Trying not to get my hopes up though, I guess only time will tell and we will see. I just needed to rant... (please excuse the super orange tests, I’ve been battling a uti) 😩