How long does estradiol tabs take to work?

Sophie • Baby 2 on the way
My doc found during my <a href="https://glowing.com/glow-fertility-program">iui</a> that i have vaginal dryness and seem to be estrogen deficient.She prescribed evatone 2mg (estradiol valerate) for 20 days starting from the day of <a href="https://glowing.com/glow-fertility-program">iui</a>?I wish she prescribed this earlier!is it too late?will the tablets work to build up my estrogen levels and improve my lining before implantation?