SSS Maternity Benefit

Hi mamas! Due ko po is Sept 2023. (months na counted sa hulugan is April 2022-March2023) April 2022 - employed pa po ako. Jan & Feb 2023 - nagbayad po ako as voluntary Question: Pwede pa kaya ako magbayad this March 2023 para ma full ko yung benefit na instead of 28k, 35k makukuha ko? Thank you po