What's the pregnancy content? And is it already in the game?
Yes, if you have had vaginal sex you may be pregnant. This is already in the game.
In general, you are definitely not pregnant at the beginning of the game, even if some Origins include sex affairs as part of their background.
But you can get pregnant as early as chapter 1. How do you know for sure? You don't. You, as the player, know no more than the heroine herself. And women, well, let's just say they don't know 100% whether or not they got pregnant after sex. Over time... the consequences will manifest themselves.
The pregnancy mechanism itself is one of literally two mechanisms in the game operating on random variables. I don't really like randomness in games. What's great for tabletop RPGs is often not so good for CRPGs. But in Inner Empire, given that there will sometimes be fairly long time gaps between chapters, it's the best option.
Don't want to name the exact chances. Let's just say that if you go through all the vaginal sex scenes in chapter 1, the chances of you being pregnant are very high.