As for me, this pregnancy problem is not really that persistent for me. For example, I noticed that when a female Sim gets pregnant, you can't do a pregnancy test by clicking on the toilet. However, the behavior of a pregnant Sim gives hints that she is pregnant and she acts as if she is sick and bubbles with a rattle or cradle pop up over her. When she is still before the first trimester, her need for hunger does not decrease, as it was before. Additionally, the pregnancy notification does not pop up when the first trimester begins. However, if you go into CAS and want to change the gender of a Sim, if she is actually pregnant, CAS will not allow you to change the gender, as it always has.