Could be fluid build up get her up and walking about, exercise will also make her poo regular as constipation can be another factor. make sure she has loads to drink too.
Are the lumps hard/squigy? do they hurt her when you touch?
Vets bill Ouch, similar case with my feed bill this month
Anyway hope she progresses nicely and the piglets do well.
You know where i am if you're stuck, oink oink!
best Mandy