Salam! Boleh je rasa baby mengeras at 19 weeks, tu biasanya Braxton Hicks contractions (fake contractions), yang normal dalam pregnancy lagi pun lepas first trimester. Tapi since you're worried, best check dengan doctor kau just to be safe, sebab they'll do a proper scan and make sure everything okay with you and baby! A few of my mum friends experienced the same thing and doc reassured them it was normal, so jangan stress sangat ye