Yeah I give same advice, if you know you want kids and found your partner just start soon. We didn’t have many fertility issues just weeding out some unfortunate genetics, but I’ve seen people try for years and it’s really taxing on both the individual and relationship.
The stuff we weeded out was on my wife’s side and the boy ended up being my clone. We joke about it as if we weeded out all of her genes. Even small things like his cowlicks and how his teeth are coming it are exactly like mine which I never would have expected to even be possible (I never gave it much thought tbh)