I joined with a weanling as my second horse, but it’s not showing up in my stable. Also, if it’s not born yet, I would like to know when it will be born so I can plan ahead a little bit.
Fixed. The script wasn’t expecting your only unborn foal to be a created one.
(The due date is a guesstimate because there’s no mare for the vet to check status of, so it will change when you reload the page. It’s in the right ballpark, though. 
)