Every life has beginning.
However, Decisions making is.
Decisions are constant requirement, without which nothing can happen.
What is certain is that either one or both parties made a decision, whether it was a good one or not, one thing is indisputably certain; you are a product of decision.
That act could be a well-thought-through event or a random one, by consensus addendum, or otherwise.
Your life began when two people a man and a woman or one of these two decided to cause an act.
Every life has beginning