In the case of a pregnant woman described in subsection (a)(10) who, because of a change in income of the family of which she is a member, would not otherwise continue to be described in such subsection, the woman shall be deemed to continue to be an individual described in subsection (a)(10)(A)(i)(IV) and subsection ( l )(1)(A) without regard to such change of income through the end of the month in which the 60-day period (beginning on the last day of her pregnancy) ends. The preceding sentence shall not apply in the case of a woman who has been provided ambulatory prenatal care pursuant to section 1396r–1 of this title during a presumptive eligibility period and is then, in accordance with such section, determined to be ineligible for medical assistance under the State plan.