Ay, weird talaga yan ng dosage difference! Sa amin, ang first OB ko nag-prescribe din ng higher dose in the beginning, then nag-adjust down after first trimester, pero 5mg sounds very low compared sa 350mg na binigay ng first doctor mo. Honestly, since pregnancy vitamin dosages can really vary depending on your health history and blood work, I'd suggest bringing this up sa your current OB para ma-clarify kung bakit ganyan ang adjustment, kasi maraming moms sa grupo namin nag-confirm na usually mas mataas pa rin ang prescribed dose throughout pregnancy. Better safe than sorry with these things, especially ngayon ka pa lang sa second trimester, make sure lang your doctor explains the reasoning behind that drop!