Hello and welcome!
Yes, that's a very typical and commonly occurring start-up side effect. The good news is, it's pretty short lived. Most people report that the side effects start to really improve after a week or two. My experience with Zoloft has been good, I'm on it again now for the second time, and I experienced the same side effect, feeling very "jittery", "amped up", shaky, as if I drank 12 pots of coffee.