There's a cheat to detect pregnancies at a very early stage. Visit the slave guild, click "Services" and select your slave:
- if the "Sterilize" service is available, she is not pregnant
- if the "Commit Abortion" service is available, she is pregnant and she has completed at least 1/6 of her gestation period
- if neither of these two services is available (and your slave has a working womb), she has been impregnated a few days earlier (less than 1/6 of her gestation period)
If you appoint someone as Headgirl, she will alert you if a slave is pregnant, but not immediately. In the daily report you will read:
- at 40% of her gestation period: X appears to be pregnant
- at ~76% of her gestation period: X will likely give birth soon
If you open the slave's profile, you may read:
- at 25% (or more) of her gestation period: Her unborn fetus causes her belly to bulge slightly
- at 50% (or more) of her gestation period: Her advanced pregnancy is clearly evident by the prominent bulge in her belly
- at 67% (or more) of her gestation period: Her unborn child forces her belly to protrude massively; she will give birth soon