You certainly didn't have a brain or nervous system at the moment you were conceived. So there had to be some point in your development where you made the switch to being "conscious to pain".
If you decide that consciousness [of pain] can’t possibly be a binary switch, then perhaps that also means being conscious isn’t a binary property.
If it isn’t a binary property, then is it a property that varies in degree based on developmental age (e.g. counting day 0 as conception)? Is it a quantity that can be measured quantitatively?
If it can be measured, do some fully developed humans have more or less of it? Do some non-humans have more or less of it?
