give you an uterine wash of G-CSF. I had a lining of only 5mm at ER and got the uterine wash....and had a 8-9mm lining by mid-LP. On another cycle, I had the G-CSF on trigger day when my lining was again 5-6mm and on ER - 36 hours later - lining was 6-7mm, and probably kept growing a bit.
Most RE's may not be familiar with using it but my new RE used it for me and "tried" it...he said this stuff really works! Supposed to get you to a 7mm minimum lining, but it may not work for everyone. It's experimental but I'd give it a go if you can convince your RE. Tell him/her that if it cannot hurt, will he or she try it.