Girls... We're in the third trimester. I lie on my right side and as s…

Girls... We're in the third trimester. I lie on my right side and as soon as it hits my chest inside too, it's on the right. And at night when I turn over on my back from the right side, it hurts so much. What could this be? The baby is feeding on both sides. And during the day, when I walk, it can sting.