Sows estrus cycle signs

[Bourbon]

I think my sow is in estrus, she makes a Long purring noise and she moves her hips left and right slowly, its really funny but also really weird if its the first time you see it!
There is also a big pee stamp in the center of her cage but its really weird cause she always pee and poo in her litter box, is it related to estrus or she just peed there for no reason? also how long is she going to act like this?

 

[Siikibam]

May be she just peed there. It shouldn’t last long. How are the pups doing?

 

[Bourbon]

May be she just peed there. It shouldn’t last long. How are the pups doing?

Yes maybe, its also big to be just normal pee but it could! Babies are doing perfectly fine, eating a lot of hay and milk less since today that she started acting a little weird, girl is 190gr and the boy is 210! Btw just to make sure is that behaviour part of her estrus? She is purring and move her hips left and right slowly like she is dancing

 

[Siikibam]

Yes it’s all normal. Have a read of the link below.
Sows: Behaviour and female health problems (including ovarian cysts)