Pregnancy chances are dependent on the mod’s sex system.Has its own body system that makes sims anatomically correct, ie: no more barbie bodies.Uses its own ‘sex system’ that enables the use of custom detailed sex animations.
To help make this decision a little easier, I’ll outline these things below: Wicked Whims (18+)
While both mods provide an Attractiveness System (think turn ons and turn offs but even more detailed than you could’ve ever imagined), Menstrual, Pregnancy and Birth Control Systems as well as Personality and Impression Systems - there are a few ways that each mod handles these things differently which will ultimately determine which one is right for you. While they’re both similar at the core, there are some notable differences that may leave you wondering which one is right for you and your game. Wicked Whims (18+) and Wonderful Whims are both amazing mods that provide game changing features for sims’ personalities and relationships.
If you’re new to installing custom content, check out this step-by-step guide.