Sayang, ini definitely perlu check dengan doctor as soon as possible, OK? Baby's movements kurang aktif selepas jab, walaupun anterior placenta pun membuat susah nak rasa, tapi better safe than sorry lah. A few of my mum friends pun pernah worried pasal pergerakan after vaccines during pregnancy, and dorang semua pergi scan je to be reassured, doctor can check everything proper-proper. Don't wait, just call your gynae or go to the clinic today if you can! Anterior placenta or not, if something feels different, that's your mummy instinct telling you something, and we should always listen to that. Hang in there, sending you good thoughts!