Eh, honestly 31 weeks is macam early lagi but boleh lah start sikit-sikit! A few of my mum friends siap barang around 32-34 weeks je, so you're actually ahead of the game. Biasanya most people finish by 36 weeks at least, just in case baby decides nak datang awal kan, better safe than sorry! Boleh siap slowly without rushing, then double-check everything around 35-36 weeks so nothing tertinggal.