Lower back pain and hips

I’m currently 22 weeks and 5 days, last week I went in to see my Ob because I was getting some pressure and lower back aches. She checked me and said it sounds like I’m

Not getting enough water intake and could be RL. My uterus was good. Tonight my lower back pain is back and throbbing pretty bad.. the baby moves and it relieves a little bit of the pain.. so I wonder if it’s his position. but the pain Is

Radiating down to my hips.. constant harsh throbbing. Is anyone else experiencing this? I have upped my intake of water.