<t>its been my experience that most gilts or sows will not stand until swelling and discharge are completely gone, the spinning and running normally happens if they are still swollen and not ready. having a boar really makes a difference in detection. could it be possible that you may be a day early...

just out of curiosity i done a search of pig/probiotics and saw several studies that seem to support the use of probiotics. there is even an article on the pigsite.