Siang! Congrats on 7 weeks! Yah, commonly third pregnancy tummy memang lebih cepat nampak besar because your uterus muscles dah stretched dari pregnancies before, so your belly relax and expand faster, bukan sebab baby tu lebih besar. A few of my mum friends who pregnant third time semua cakap sama, their bumps show much earlier than first two. Tapi just to be safe, best check with your doctor during your appointment nanti to make sure everything is progressing normally, they can confirm if it's just normal uterine laxity or if anything else is happening. Congrats again!