The intent was to scar you. It was intended to make you equate the rice sized embryo in your womb with a fully formed baby ready for a live birth. It was meant to inflict terror upon you, to make you believe you couldn't possibly have a choice – to force you to give birth.
What you saw was likely a late-term abortion. And, as I said, those only happen when something has already gone catastrophically wrong in the pregnancy. The fetus was almost certainly already dead. Before you jump, yes, dead tissue may still produce reflex responses. Ask any morgue attendant or funeral director.
As to sending you links, there are many. I'm cannot do your research for you. My own knowledge is from year upon year upon year of reading and trying to understand the truths in the issue and to discern the manipulations and lies. Go to reliable scientific resources for your research. Like Kaiser Health News, for example. Go to NPR or NatGeo and search for science articles there. Look to the Mayo Clinic or any reputable teaching hospital. Look for the science.
I will share one article with you which may help set you on your search: https://www.npr.org/2006/02/21/5168163/partial-birth-abortion-separating-fact-from-spin