Growth restriction in Di Di Twins?

Anyone experienced this? I'm 27 weeks and just had another ultrasound - Twin A is only in the 11 percentile and Twin B is in the 40th. They are having me come back in 4 weeks to see if Twin A has a growth spurt, but they are concerned that she may have intrauterine growth restriction. My doctors didn't really go much in - depth (more like, we will worry about it if it is still a size difference in 4 weeks), but of course I have been on Google and now have freaked myself out.

Anyone have a big size difference in their twins that worked itself out? I'm having di di girls. TIA