Aw mommy, at 33+ weeks that's still possible naman, marami sa amin na nag-experience ng low placenta na tumaas pa towards the end of pregnancy, ang uterus kasi lumalaki pa, so it can shift pa! But honestly, better to ask your OB about this sa next check-up para ma-monitor nang maigi ang position nito, kasi important talaga alam natin kung ano ang situation mo especially as you get closer sa delivery date. Fingers crossed for you, mommy!