17 weeks, haven't felt baby move in 2 or 3 days

Ashes

Usually I feel the accasional thumps on my left side but here lately I feel like I can't feel the baby and its making me very scared, I don't know if it's normal or not and I can't really remember what happened with my son.. I'm probably just worrying myself, I had a appointment the 5th and she said everything was great and heard heartbeat like every appointment but Ive been so use to feeling something at night..