Hindi ka mag-iisa sa concern na yan, a few of my mum friends din nag-worry about the same thing during their pregnancy! But honestly, from what I understand, ang placenta maturity grades ay normal lang na nag-vary from mom to mom, and Grade 1 at 33 weeks isn't necessarily something you can really "speed up" or control on your own, kaya i'd really suggest bringing this up sa OB mo to get their take on what's normal for your specific situation. Wala kaming power mag-influence dyan talaga, pero your doctor can explain kung okay lang ba yan for you or kung may follow-up ultrasound needed lang to monitor, they'll know best what your body needs!