Eh sayang, perut mengeras macam tu adalah Braxton Hicks contractions, memang normal tapi kalau frequent atau ada pain, kena check dengan doctor okay, jangan tunggu. At 35 weeks, baby biasanya around 2, 2.5kg, tapi setiap baby beza, ada yang lebih berat sikit, ada yang lighter, so don't worry too much about the numbers. A few of my mum friends said they experienced the same thing before delivery, some labour awal sikit, some stay in oven lagi, so really individual je! Get yourself checked to be safe, especially kalau perut terus mengeras or you feel anything unusual, better safe than sorry at this stage!