So I took Elsa and Jake to the vets today for a pre-op check before being neutered next week. I was concerned that the cats are older than the previous owners told us (they told us 4.5 months) and that elsa may already be pregnant as she's getting very fat and is very grumpy and protective of her food.
As it turns out, Elsa is a boy with only one bollock and Jake is a girl who is infact pregnant.
So I had to leave my poor babies there so that tomorrow boy cat can have his one bollock chopped off whilst they have a fish around for the other one and the girl cat gets her bits and her babies taken away (which is absolutely heartbreaking but Jake and Elsa are brother and sister so babies are likely to be deformed). And the vet estimates the cats are about 7-8 months.
Poor babies :(