Sayang, rasa ngilu kat bahagian ari-ari masa pregnant boleh jadi banyak sebab, sometimes it's just ligament stretching, sometimes it needs checking. Best la you go see your doctor or midwife soon, terutama since you're at 29 weeks; they can confirm everything okay dengan baby and placenta tu. A few of my mum friends ada yang rasa gitu juga, tapi setiap orang lain, so better safe than sorry, ya?