Inactive sim got pregnant while playing other sim

Hey everyone, I was playing Sims 4 when I decided to create a brother for my main sim. I played his world for a few hours and saw that my main characters girlfriend was pregnant. I went back to my main sim and confirmed that they indeed did the deed off screen.

I'm not ready for my main sims to have kids, atleast not randomly off screen. Is there a way I can reverse time so that this doesn't happen?