Ay hindi ko alam kung bakit may confusion sa due date, pero mas importante talaga ang condition ng baby at placenta, better na i-clarify mo with your OB kung bakit may difference between the dates na sinabi nila, baka may adjustment lang based sa latest ultrasound! Grade 2 placenta at 3kls baby ay normal naman sa late pregnancy, pero since concerned na si doc about diet, sigurado akong may specific reason siya, kaya follow his advice talaga para safe lang both of you. One of my mum friends had similar situation and nag-strict diet siya in the last weeks, then lahat naging okay, medyo challenging ang timing para sa diet, pero doable talaga if you know what to avoid. Better to ask your OB directly anong specific foods to cut back on or focus on, para Hindi ka mag-guess.