So I have played plus and while waiting for 15.0 to come out I decided to play the original, and I decided "Might as well find out how to get the NPC's pregnant" the only problem being, there is nothing on the wiki and nothing useful on these discussions, so with that, how do I get the NPC's pregnant?

I don't quite think that pregnancy was ever implemented in LDO (Original)

It only is possible in LD+.