Yes fetuses are human, but theyir status as human, their ability to survive is solely dependant upon another person. I'm pro-choice because clearly though I think it would be the more humane thing to do to help another person live no one should be forced into being what I or anyone else think is a good humane person.
Example, if someone needed a kidney and I was deformed and had a third one I STILL would not give it. They have no right to my body whether I'm using it, they'll die without it or not. Same goes for fetuses. My child because of MY choice could get one of my two kidneys in a heartbeat and all of the blood I could pump and spare to him if he needs it.
Because the unborn have to rely upon the mother to live its totally up to the mother whether it will or wont. I dont see the logic in killing a fetus vs simply removing it (delivering it thus ending the pregnancy and givng the woman or child full control of her body again because the fetus is no longer there).
Modern science is getting closer and closer to the need for human incubation as babies survive more and more younger and younger outside of the womb. Hopefully there will be a day when the only women who ever become pregnant are the ones who intentionally and wanted to become pregnant.