I do pregnancy tests to my slaves.
But not the ones where you wonder whether the slave is pregnant or not, I just make sure to fuck them often enough and they all get pregnant.
I test them the first time they give birth to a few daughters of mine.
As soon as she is off the delivery table, often still bloody and with her belly still big, I choose one of the girls she gave birth to and I ask her to kill it.
Most of the time, she is astonished, wondering what I meant. At that point I take the child and I snap her neck, killing her immediately.
Then I ask the mother again, to kill another of her children and she normally got the clue that I will continue to kill them one by one until she obeys.
The next question I get asked is usually how she should kill her daughter.
I'd left it to her the choice of the dispatching method, but if I'm asked then I reply: "Grab her by her feet and smash her head in that wall corner!"
And since she asked in the first place, that is what she is now compelled to do.
I love to watch this scene and even if the death of the girl is quick, that's good since I can't wait to fuck the mother long and hard while she still holds the scattered remains of her newborn child that she just killed.