Eh normal je, 37 weeks tu uterus dah besar dan pressure pada paru-paru memang buat breathing jadi heavy! A few of my mum friends complained pasal yang sama time dekat end of pregnancy. But since you're feeling quite breathless even with light activity, better check with your doctor just to be safe, boleh jadi baby position, iron levels, atau something else yang perlu attention, so best to mention it at your next checkup okay?