Can’t move around postpartum?

I am one week postpartum (from my 4th baby) and I have NEVER experienced this. I feel like I have absolutely no strength or support in my pelvis or thighs. I can barely walk. Even trying to roll over in bed or sit up or get off the couch is a struggle. Is this normal?? I know it’s only been one week but it hasn’t improved at all. I’ve never not been able to function before. The other three times I could still walk and move and bend over etc. Just wanting to know if this happens to others or if I should be concerned. Thanks.