I Got Pregnant with the Tyrant's Child(2020)

For Elan the royal knight, the masquerade festival is a rare chance to let loose and relax. But her night of fun quickly turns into a morning of horror when she wakes up beside the ruthless Emperor Kylart. Knowing how cruel he can be to clingy women, Elan makes a run for it, hoping he hasn't seen past her disguise. But as she continues her nerve-wracking duties of guarding the emperor, she starts experiencing troubling health symptoms. A trip to the doctor reveals that she's pregnant! To make matters worse, rumor has it that Kylart is looking for the mysterious woman he met on the night of the festival. Can Elan keep her secret safe from the entire palace, when she can't even control her constant cravings and morning sickness?

(Source: Tappytoon)