“After they have succumbed to the desire again, as so many do, and the phenomenon of craving develops, they pass through the well-known stages of a spree, emerging remorseful, with a firm resolution not to drink again.” (The Doctor’s Opinion, Big Book)
The period of sobriety is part of the spree: regenerating the system, purging the guilt, repairing some of the damage, clipping coupons and earning vouchers for the next drink. This is not a relapse: it is merely the cycle coming full circle. A relapse is possible only after full recovery has been achieved.