Decreased movement at 33 weeks

Mr
 Usually when I do a kick count after having cold water or juice I will feel him kick 10 times in about 7 minutes. He is a very active baby. Today I noticed I wasn't feeling him as much. After my juice I only felt him about 5 times in half hour and they were supppppper low. 
Called midwife and she said it sounds okay because I did get some movements but to go in later tonight for a non stress test if I am still worried later/movement still hadn't picked up. 
I can't help but worry. :( Anyone else in the same boat?