It all boils down to whether you believe life begins at conception or at birth. I believe it begins at birth. I am pro-choice but do not support abortions beyond the second trimester for reasons other than medical emergency or defects with the fetus nor do I support abortion at any time if it is simply being used as a form of birth control.
Regardless of the science that proves life begins at conception...and that said life is not just a blob of tissue. So with your belief there, do you ever ask an expecting mother "when's your fetus due?"
T here is a tremendous consensus in the scientific community about when life begins. This is hardly controversial. If the claim were made that life was discovered on another planet, for example, there are well-defined criteria to which we could refer to conclusively determine whether the claim was accurate. How do scientists distinguish between life and non-life?
A scientific textbook called "Basics of Biology" gives five characteristics of living things; these five criteria are found in all modern elementary scientific textbooks:
1. Living things are highly organized.
2. All living things have an ability to acquire materials and energy.
3. All living things have an ability to respond to their environment.
4. All living things have an ability to reproduce.
5. All living things have an ability to adapt.
According to this elementary definition of life, life begins at fertilization, when a sperm unites with an oocyte.