Right the vet has been. Took advantage of having someone with a scanner out and got the others scanned too. Huelwen, the goat who I thought was pregnant is, probably a single. Eira, the one I was pretty sure wasn't, isn't and Blossom who is the goat i'm pretty sure has hydrometra is carrying twins!
The vet had agreed with my provisional diagnosis and scanned to be on the safe side. She was so surprised she made me look at the scan myself and definitely a foetus!
The question is WHO'S THE DADDY!? We had a billy here 2 months ago but he was kept separate and was never with her unsupervised. It is possible that he jumped the fence and then jumped back again into his pen which seems a bit unlikely but not impossible I guess. The vet also thought that the foetus was bigger than the other goat's so further along (Blossom looks massive!). The alternative is the ram but hybrids are very uncommon so probably unlikely and they very rarely go to term. I have checked my records and I thought she was in season less than 2 months ago so clearly I have no idea!
All a bit embarrassing but also a bit exciting and a bit scary!
I am clearly a terrible goat keeper.