March 25 is the feast of the Annunciation of our Lord, which is basically the celebration of Jesus’ conception in Mary’s womb. Do we celebrate it? Mostly, no.
But think about this: the annunciation is the moment that the promise of the Messiah was fulfilled. This is the moment when God squeezed Himself into a single cell, a zygote.
We believe that life begins at conception, but we don’t celebrate accordingly. We celebrate Christmas, which isn’t nearly as big a deal as Jesus’ incarnation, which occurred at conception.

Something to ponder, anyway.