if rebirth/reincarnation is true then what is your first birth/incarnation?
Do you think someone might have asked that question before?
According to Access to Insight, many of the suttas include the following quote,

At Savatthi. There the Blessed One said:

&quot;From an inconstruable beginning comes transmigration. A beginning point is not evident, though beings hindered by ignorance and fettered by craving are transmigrating &amp; wandering on.


In other words the &quot;first&quot; is not evident (or, I'd read that as, it's not evident that there is a first).