As someone who has taught college classes, I appreciate the content warnings. (I prefer this term to trigger warnings, as people are now callously using the term trigger as a joke). I taught Psychology and that class is FULL of touchy topics. The one that I did make known was the day that we would be discussing suicide. I made sure to give the students warning and tell them that they were free to skip that day or any other day that was too upsetting to them. (I didn't take attendance anyway).
See, so many folks who don't teach, and who don't make decisions about education don't understand that this is actually an opportunity for empowerment. I treated my students like adults, not children. Giving them warning, and making it their decision was putting the power in their hands. College students experience a lot. Pregnancy is likely something that in a class of 30 students, at least 2 or 3 of the girls in there have experienced. Either through abortion, miscarriage, scares, plan B, etc. If this was something that they had experienced last week, then yeah a content warning is probably nice.
The thing about warnings is that they are not hurting anyone. Anytime you turn on Netflix, there's content warnings. For the one person they may help, that can literally mean giving them the power to support their own mental health. That's huge.