Gut feelings

I’m only 5DPO right now, so it’s way too soon to know, but I have a gut feeling it’s not my cycle.

Does anyone with children have experience with this kinda thing? Am I crazy to count myself out based on instinct?

I’m honestly not even in a rush to have kids, but every time it doesn’t happen I wonder if maybe I can’t. I’m getting older and my mom had fertility issues in her 20’s so I just always assumed. . .(I have a full work up scheduled for Dec 1 because that’s the soonest I could get in here on this island).