Here we go: photographic evidence that I really do have two little people inside me!
Anyway, they seem to be very well bedded-in and have lovely strong heartbeats. Twin A (the bottom one) is 25 mm at the moment, and Twin B is 23.5 mm.
My next scan will be at 13 weeks, by which stage we should be able to get some snazzy 3D images. Cool!