Weaning Scours?

Has anyone ever had a foal that started scouring once it was weaned? One of my girls has had the runs for the couple of days since she was weaned. She's been on hard feed already so her diet hasn't changed other than no longer getting the milk. She's about to be wormed for the first time, but I am not sure if I should do it while she is like this in case it unsettles her even more. She doesn't appear to be sick, she's still acting, drinking and eating normally, and if it keeps up, I will definitely get the vet in the morning, but thought I would check on here in the meantime.

Never mind, I was worried about nothing! It's all cleaned up today!!!