not a lot of fetal movement

So I guess to start, I am 33 weeks and my little girl is usually very active and strong with her movements. Today I have barely felt her. I thought maybe because we did a little more walking than normal that I wasn't paying attention but after eating dinner and just sitting on our couch, I can feel her move but they are faint and definitely not as frequent. I don't know if I am over reacting or not. Any opinions?