If the services performed during one-half or more of any pay period by an individual for an employing unit constitute employment, all of the services of such individual for such period shall be deemed to be employment, but if the services performed during more than one-half of any such pay period by an individual for an employing unit do not constitute employment, then none of the services of such individual on behalf of such employing unit for such period shall be deemed to be employment. As used in this paragraph, the term "pay period" means a period of not more than thirty-one consecutive days for which a payment of remuneration is ordinarily made to an individual by the employing unit.