Was what I said wrong in any way?

So I'm in a very intensive and stressful program for school. I'm in class 8 hours a day and spend at least 4 hours studying a night. And everyone on my class has the same problem. None of us has a life because school's our life for the next 4 years. 
One of the girls in my class (it's a small class and everyone is friends with everyone) is pregnant. Her birth control failed and she has decided to have an abortion because she just can't handle a baby right now. She asked a few of the girls what we would do and most people agreed that they'd have the abortion as well. Someone asked me directly and I said I would go for adoption probably. I mentioned that I understood why she was choosing abortion and I support her (I'm actually going with this girl to the appointment- I don't really know why she asked me because we're friends, but not incrediably close). But for me life starts at conception (I'm catholic and it's a well known fact with my friends) and I just couldn't have an abortion for religious/personal reasons. I'd never forgive myself. 
Then someone just ripped into me about not being pro-choice and how I was judging people who had an abortion (I try not to judge people- I believe that's God's job and not mine. The only time I really have an issue with abortion is when people use it as a form of birth control not just when birth control fails). She spent about 5 minutes just ripping into me. Normally I'd brush it off but I'm feeling really confused and upset. Though I don't agree with abortion I'd never tell someone they shouldn't have one. It's a personal choice and it doesn't affect me. I'd have the baby. I don't see what's wrong with that. But am I just not seeing something here- did I say something really horrible and wrong?

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