l'm not sure about the Wee Foal test but we had DotCom go over her due date by about 20 days and l told my daughter l was throwing her back out in the field and l swore l saw her show heat to a stallion ...she had already been scanned twice had early and late blood tests done all neg. never looked in foal gained any weight you could go by made no bag didn't drop never stretched never saw a flutter or any momement NOTHING she acted and looked like a barren mare. l called my daughter on the Friday to tell her l was putting her out that day and she screamed and carried on NO NO NO she's going to have a baby l just know she is. l said okay l'd wait till after the weekend but that was it come Monday she's out of the barn l need that space for another mare..no sooner said and she had a filly Eddie the next night...good thing to because she needed help out of the bag or would have been lost. So you never can tell