No secular college (or college with religious roots that isn’t still super religious) is going to have a problem with it. I was an intern at Planned Parenthood & am involved in the pro-choice movement and have been successful in the college admissions process so far- I included my experience fully in apps.
One note- I know people tend to advise not talking about reproductive rights/controversial issues in college essays. I was accepted into the Cornell ILR & talked about PP in my supplement, but I framed it as looking at the relationship between public & private sectors in terms of health & women’s issues. It’s all about how you use it!