Your appendix consists of your cells, while a fetus doesn't consist of your cells. Hence, the proper comparison would be "You have as much right to kill a fetus as you have to kill an appendix that isn't yours." (Hey, an appendix is just a batch of cells that will never become a human being.)
If a fetus dying is an abortion, God is the greatest abortionist.
If you subscribe to this whole creator thing, then you should realize that every living thing is mortal - it's just a matter of time - and hence someone who claims to have created everything is also responsible for everything dying at some point.