Welcome! As we've discussed, you won't likely notice any side effects for 3-4 weeks. Most likely then are probably fatigue and hot flashes.
Other physical changes happen by around 3 months.
You may enjoy reading this thread, back when Peter DisAbleard was starting HT:
www.healingwell.com/community/default.aspx?f=35&m=2465079(By the way, I think the pod people were always the same sex as whomever they replaced...)