Hi m24!! 12 follies is great. Thats great especially being your first IVF cycle, and that means well, that your first cycle is sort of an experiment- your FS wont really know how you will respond to the meds until your bloods and scans. You prob have a few more days on injections to make the follies bigger, but i think you should def be happy
Like Ellie said, they will be looking at the number of follicles you have corresponding to your estrogen levels and your estrogen levels should be increasing nicely. I think (not definite) that one of the nurse said that the estr level per follicle should be around 500-600 when ready for EPU.
Good luck for tomorrow, hope things go really well.
Mel