Eh, ni memang normal lah at 29 weeks, perut yang makin besar puts so much pressure on your ligaments and muscles, menyebabkan yang tight feeling tu. A few of my mum friends had the same thing dekat third trimester ni, rasa macam perut tengah ditarik-tarik je, especially when walking or lifting anything. Try to take it easy, avoid lifting yang berat, dan maybe wear a maternity support belt yang helped my friends quite a bit, it really takes the load off. Kalau rasa sakit yang lain or if the tightness becomes painful, better check with your doctor just to be safe, tapi yang you describe tu memang the pregnancy weight catching up lah!