Alah, tu normal lah! Dengan baby ke-4, uterus dah experienced, so Braxton Hicks boleh start earlier, some of my mum friends felt it around 16-18 weeks dengan second baby onwards. Tapi kalau it's happening frequently, painful, or ada spotting, better check with your doctor to be safe, especially since every pregnancy is different even kalau dah ada 3 anak dah. Drink more water, rest more, and jangan worry too much, your body tahu apa yang dia buat!