From a scientific perspective life undoubtly starta before birth. That aaid bacteria is also life... the definition of where life starts as much as it matters for killing a bacteria. The fact is someone had the oppertunity at some point in the past to prevent my current life from existing, so i should have a say in matters where we discuss how much right i have to my life. We are discussing if someone haf a right to prevent my life, so clearly i should have a say in that.