Tailbone and Vagina Pain

Okay ladies, I’m in a lot of pain and I’m not sure it’s normal. I’m 30 weeks pregnant with my first LO. When I go to switch sides in bed, sit up, stand up, shift my weight in any way I have extreme pain down south. When he is breech I don’t have this pain but when he’s head down I feel like my tailbone is going to snap off and my vagina is going to split in two. Has anyone else dealt with this? I was just diagnosed with polyhydramnios on top of it all about a three weeks ago so I’m not sure if it’s the added weight or...? Maybe he’s just got a big noggin lol. Any advice would be much appreciated.🙏🏼👍🏼