Holding tail after delivering

My cat Jessie just had her kittens! Four to be exact. Just yesterday

I noticed her doing something interesting today though...

I noticed today she would grab her tail with her mouth and would walk back to the box where her kittens are where she could lay down.. And if she drops her tail, she instantly grabs it again.. It looks kinda weird because she walks in circles while she has her tail in her mouth, but I think that's because that's the only way for her to walk straight and she wear she is going..

Everything else is fine, but there will be brief moments where she'll grab her tail with her mouth and walk back to her box.. I'm thinking maybe she is just sore from just having labor and maybe dragging her tail might bother her..

Any ideas?

Does anyone have ideas?

I think I would call my vet to see if it is something to worry about - I have no idea. But it does seem strange.

I'm thinking maybe somehow she's displaced something during the delivery, done herself an injury in the pelvic area that's causing the weight of her tail hanging down to be painful to her. Please do take her in to the vet!