Tell your parents that is your little clump of mindless cells in there and if they kill it then you will hate them forever and never speak to them again. That's what I would do. If my parents got an abortion I could never forgive them and as soon as I get a place of my own I would move far away and never see them again.
Then they would loose both you and the mindless clump of cells and be left alone living the rest of their lives knowing they are murderers and that you hate them.
Seriously I beg of you to stop your parents from getting an abortion, do anything in your power to save your mindless clump of cells, I beg of you, please!
Tell them to put it up for adoption if they have too. But do not let them kill that innocent clump, it has as much right to live as you and I.
PLEASE!!!