Girls, hello! Yesterday was our ultrasound at 21 weeks. Everything is …

Girls, hello! Yesterday was our ultrasound at 21 weeks. Everything is great with the baby boy. We're growing. But the head is lying very low. I'm very worried, but the condition is normal. Sometimes my back hurts. That's why I'm worried because I read everything online. Does anyone have a baby whose head is also lying down low? Everything will be fine.