Ay mama, ang dating months talaga ng pregnancy ito, lalo na kung may fainting spells ka! Based sa sinabi mo ng OB mo, I'd go with TVS dating since nakita niya mismo through ultrasound, mas accurate yan kaysa counting from LMP, especially kung variable ang cycle mo. As for the OGTT, totoo na demanding ito physically, pero seryoso, kailangan mo talaga i-mention sa OB na nangyayari sayo ang repeated fainting, kasi that's not normal at kailangan ninyong ma-address together bago ka mag-OGTT or any test na nangangailangan ng fasting. Baka may something na dapat i-check like anemia or blood sugar issues na kailangan ma-manage muna, so please don't skip telling her this part! Hindi ka nag-iisa sa struggle na ito, pero ang safety mo at baby ay dapat priority talaga, kaya I really think checking in about the fainting is the first step, hindi just pushing through ang OGTT.