First buy yourself an incubator and 21 fertilized chicken eggs. You can easily order them through the mail. A human pregnancy is three trimesters and a chicken embryo takes three week to hatch. So you could assign one week to each trimester. Each day crack one egg and take a look, better yet, fry yourself up some scrambled eggs. See at what point you become uncomfortable with the task.
I'm guessing there are some sadistic individuals that will have no problem with all twenty one days, but the rest of us will stop somewhere in the first two weeks. I couldn't do it after the first day, but that's me.
Also, for all you pro-choice vegetarians out there, ask yourself if you could eat cow embryos.
I'm with Hilary Clinton on this particular topic. I don't like abortion. I wouldn't have an abortion, although they termed my miscarriage a spontaneous abortion. I know there are times when it is necessary, tubal pregnancy for example. It needs to be safe, legal, and extremely rare! If I could underline extremely five times, I would.
and what about embryonic stem cell research?