If you are in the "all people are created equal camp", then scientifically its not a person until birth, so that would be the time of creation. I personally disagree with this perspective, and believe that at some point of development the fetus also begins to have rights.
Time of creation is when the sperm fetrilzies the egg, and cells start to divide. At that point a new life form has been created.
What is the difference between your viewpoint that fetus is not a real person until birth and:
Blacks are not real people.
Native Americans are not real people.
Jews are not real people... etc?
Also, if you say, "A fetus is not a real person until it is born", then you do not believe all people are created equal.
By placing the goal post at birth, then you erect an arbitrary barrier.
The birth goal post is no different than:
Being a free person to vote.
Being white to vote.
Being a white property owner.
Slaves can be killed because they are property.
Jews have to be sent to the camps because the law says so.
Native Americans have to be sent to the reservations because the law says so.
One thing democrats do is move the goal post. When republicans make progress in protecting rights, democrats find another group to victimize. In the case of abortion, the victims is the unborn child and minorities.