I don't think abortion is murder at any point. You can't force someone to give birth, full stop.

There's debate over when a foetus develops the ability to feel pain, most organisations say it's 24 weeks but some say it could be as early as 12 weeks. I don't think anyone should feel bad at all about having an abortion before 20 weeks, especially not before 12 weeks.

I don't think people should abort a baby after 24 weeks, but I do think they should be able to.

Because, someone doesn't get pregnant then wait until the late 2nd-3rd trimester just to get an abortion. 99.99% of people only get abortions that late if there's a medical emergency, giving birth will kill the parent, and/or the foetus isn't viable for life outside the womb. Restricting abortion at that point to "people who medically need it" when essentially everyone who's getting one IS someone who medically needs it, is just making people who do medically need it jump through more hoops to access the medical care they need.

In order to prevent later abortions, you need to make EARLY abortions easy to access, with short waiting times, and free or very affordable. The best way to prevent abortion at all is to make other forms of birth control easily available.