Again, you're really using the idea of the 'natural' course of events that just suits your argument. Unless you believe in destiny, predetermination, etc., there is no path along which either of those things will continue without requiring additional force to reach it.

For a person to continue living or a pregnancy to continue, they must continually exert, collect, and consume energy in the form of food and water. Why isn't that additional force? The 'natural' course of events, without any outside 'force', is for everyone and every living thing to drop dead in a couple of days tops.

"Okay, but obviously living beings were designed to continue living, seeking energy to continue sustaining their existence is obviously a natural course of events" you might say, but why does it have to end there? Why isn't the very natural path that all humans begin on, one of being a social creature that desires to assist others in their tribe, the 'default' force as well?

It really seems like there can't be any clear cut answer, and it's just philosophical sleight of hand. You also haven't addressed the point that if one person wants to help the other, preventing that is clearly a form of force.