Worried About Baby Movements

This morning I woke up to find myself sleeping on my back.im 30wks pregnant and lately baby girl has been keeping me up all night with her constant movements.she doesn't allow me to sleep on either side anymore with all her stretching and kicking.so back to this morning I woke up and baby wasn't as active as she normally (which she normally is) I cooked and ate breakfast and still no avail.so now I started to worry I've been shaking my belly eating sugary things and she has started to move but not her normal movements and I'm laying on the side she hates.shes stretching out and giving me very faint hits.should I not be worried cause she is now moving or should I my doctor or l&d;