Change Alien pregnancy partner?

Hello! I’m not sure if this is the section to ask question but… Does anyone know how to change how to change your partner for alien pregnancy? I’m using mccc command center, I made a pollination technician for my male sim, and now I wanna swap the previous pollination technician with this one. I’ve  tried the change partner option, but the sim I want doesn’t show up. I also adjust the alien’s gender options to “gets others pregnant” but she still doesn’t pop up. I’ve also changed the pregnant sim’s flags, but alas the alien doesn’t show up. Can anyone help me plz? TIA! ^U^