Perut mengeras tu normal je at 35w, Braxton Hicks contractions yang biasa terjadi especially bila dah mau dekat term, tapi definitely tanya your doctor kat next visit k, especially since you're on GDM diet and baby size tu dalam range je (3kg at 35w is actually okay!). A few of my mum friends share the same worry tapi settle je after check up with doc, so jangan worry sangat, tapi better safe than sorry lah kan.