Confused

So we have been trying to have a baby for years and it just wasn't happening. I'll be 40 this year and my husband will be 46. We started the process with <a href="https://glowing.com/glow-fertility-program">IVF</a> and have been doing the initial testing. Apparently, there is nothing "wrong" with either one of us. It's getting closer to game time and we don't know if it will even work. Now my husband is questioning if we should even be doing this anymore? I guess you could say, he's getting cold feet. Of course I've had my doubts too. It's been difficult, but I don't know what to do now. Do we just call it a day and accept that maybe this is how it's supposed to be. He's got to be on board with this and I think it's taking a toll on him. We have a great life together and are happy. Am I pushing it? Any suggestions, thoughts?