First day and body aches??

I started Lexapro 10mg today. They were prescribed to me and I’m only 4hours in and I started to get bad body aches and jittery and chills a bit... I began to yawn quite more than usual and then today around 9pm slight pain and just overall full body ache. It’s not very debilitating but I definitely notice it’s sore..Is this normal on first day of lexapro?