Congratulations young lady!!!!
Oh I so remember that first day!
Many girls get instant relief from E, it is probably just a placebo effect, you feel fantastic because you have started! But it takes a few hours for E to get into your system.
Give it a week or two and get ready for the fun changes. Don't expect too much, just relax and enjoy your new life - it will hit you soon enough! Enjoy, maybe have a nice bubble bath and shave your legs and polish your nails and start to feel all girly

Hugs