Hole in block size of pencil

Hold on. We're losing something in translation here. A pencil-sized hole would leak all the coolant out in a few minutes and the engine would be overheating. You'd lose a pint of coolant in a few seconds, not a week. If you have a pencil-sized spot of rust or corrosion where you see coolant leaking from, that suggests you have a corroded core plug, often referred to as a "freeze" plug because they can pop out if the coolant is too much water and it freezes. Core plugs can be replaced but you have to buy the correct size for the application.

A much better suspect is a leaking seal in the water pump. The hole you're seeing the coolant drip from is likely the weep hole or the drain hole for any coolant that leaks into that area. A water pump seal will usually start out leaking rather slowly, but don't expect it to stay that way for long. If possible, post a picture of where the leaking is coming from. If it's a plastic cover or shield, that is covering whatever is really leaking. You'll need to remove it and dig down further to find the cause.