And someone mentioned in one of the posts that the probability is amount of sperm/10% chance. ie. If you manage to get 200ml of sperm in her and she's ovulating, then she has a 20% chance of getting pregnant. If its just you with about 10ml....then you are looking at 1%.its RNG to get the sperm and egg... uh what's the word...
then due to the game timeline and it is normal, not interspecies such, it does take a long time for proper reflection... which I believe is not implemented, didn't bother to check. But what is implemented is the ending story text depending who "mazel tov" her... just text, no CG.