Horrible back pain 16 weeks

My next appt is later this week but wanted to see if I could get some help here in the meantime.

For the last week or so, I’ve had the most horrible pain in my lower back. If I’m sitting it doesn’t bother me. But once I stand after being in one position (like at work) I’m literally so stiff and can barely walk. It hurts so bad I have to walk with a limp or hold onto something to stabilize myself.

Flipping over in bed is like a 3 point turn lol I have to go very slowly because my lower back hurts so much. And lifting my leg to put on pants it horrid. I have to grab my bed or something for support so I don’t fall.

I’m only 24 and this is my 2nd pregnancy. I’ve never experienced anything like this before.

Once I get going walking it usually fades to a dull ache and I’m fine. But if we’re busy at work (standing all day) and I get home, it hurts soooo much. Like sitting down is a relief until I have to get back up again.