baby movement

Hi guys. I'm 32+4 and my baby isn't moving much today compared to his normal routine....should I be concerned or does their movement seem to slow down the further along you get? I'm a first time mom, so I'm not sure what is normal and what isn't normal. He is moving, just not as active as usual...I even had something sweet which always getting him going and nothing. Any advice? Are babies just more sleepy some days?