If you are struggling to meet 125% of the poverty level, have you considered whether the K-1 visa is right for you? Have you considered how you are going to support another adult for several months who cannot work and will need healthcare plus the costs of AOS?
Although 125% of the federal poverty level
will pass muster at the embassy and the AOS process (assuming no major rule change between now and then), whether it is possible to live on that amount is another question. Too many applicants focus too heavily on just scraping through the financial requirements for approval and not the practicalities of day-to-day life on such a modest income. Two completely different things.