Aih, sakit pinggang masa pregnant memang susah betul! Saya dengan beberapa mum friends biasa pakai maternity support belt, kena yang proper fitted, bukan yang murah-murah je, membantu sangat untuk spread the weight. Try also posisi tidur pakai bantal extra between legs and under belly, dan avoid bending at the waist, squat je kalau ambil barang kat bawah. Tapi dear, sebab you're in first trimester and the pain is bothering you, better check with your gynae just to make sure everything's fine, they can recommend stretches or physio yang safe for pregnancy.