Boleh je tidur kiri, tu actually position terbaik for pregnancy especially at 28 weeks sebab better blood flow to baby. Weight gain 3.8kg dalam 8 weeks tu normal je, average orang gain around 0.4-0.5kg per week so you're on track, jangan worry. Kalau ada any concerns pasal breathing or leg swelling when you lie on one side, best check with your doctor just to be safe ya!