Baby moving?

Stephanie
This is my 1st pregnancy and I am 13w1d. I was laying in bed watching TV and all of the sudden felt something kind of like a muscle spasm about 2 inches below my belly button and slightly to the right. I did drink orange juice about an hour ago which I just read can make your baby active. I feel like I am feeling the baby move but also feel like it's too early especially with it being my first pregnancy. Any thoughts?