The average fetus feels pain around 20 weeks, but unfortunately, yes, as early as 12 weeks.

Here's a medical paper that discusses it:
https://jme.bmj.com/content/46/1/3

You can download the PDF and read for yourself.

"Fighting for its life" is a bit dramatic, but it's common for them to try and avoid the shredder.

Thanks for the heads up, I will certainly avoid that movie, I don't think I could handle seeing that.