24 weeks, kicks getting softer

So i am 24 weeks today! Last week baby was moving quite a bit and i was getting some strong kicks higher up, like right above my belly button. For the past few days i havent had any really good kicks and the only movement i am feeling, is very low in my pelvis, and they arent very strong. Is it normal to have days of more movement than others. Or maybe because he is so low its just harder to feel movement. I am a ftm and worry about everything, so i dont want to over react, and go to the er, since i am feeling movement. Just wanted to check with you all and see what you thought!