Hi mama! So honestly, placental grading can fluctuate a bit during pregnancy kaya hindi ka nag-iisa dito, a few of us noticed changes din sa ultrasound readings between trimesters, and ang dating due date adjustment is pretty normal too since sonographers refine estimates throughout pregnancy. But I'd really suggest bringing this up with your OB sa next visit just to make sure everything's progressing okay for you and baby, kasi sila lang talaga ang makakasagot ng specific sa case mo, better safe than sorry at 34 weeks na!