Not sure about the pregnancy test, it has come to $55 adding postage.
She hasn't as far as I know. If Id take her away from Toby for a few days, and when I put her back in with him he goes crazy and she stands for him, but he only has one burst of excitement when he sees her again and he doesn't touch her again after that thats all I've seen.
Although when we had our old Stallion Billy, he was mounting Willow up to around 3 months prior to foaling and she was standing for him giving us the impression she wasn't pregnant at all, thats another reason why we were so shocked on Bam-bam's delivery. We ended up calling her old owners and she said Willow has confused her a few times when she stands for the stallions, making her think she wasn't pregnant.