Husband doubts the validity of Glow

My husband and I got into a heated discussion about the science behind Glow. He was adamant that the margin of error is to high for it to be right. That is wrong for me to put so much trust into this app. That how can it be so certain to give you 33% chance of getting pregnant on one day. Or how does it know that is the best day, ovulation could have happened before or 5 days from now. He wants to go about trying to conceive without technology.

I got defensive because he was being so logical and focused on the negative possibility. It just burst my hopeful bubble. This is so emotional for me because I just want to be a mom so badly. I broke down and started crying and even then he tried to use logic.

I mean even though there is a chance the app could be wrong, there is still a small chance it could be correct and why not focus on that positive possibility.

Usually my husband's rationality is something I admire, but having a baby isn't something that you can rationalize your way through.