I swear there was like a tremor just now

I'm sitting on the sofa and the sofa started shaking, so I'm really parnoid so I obviously thought there was sum big creature hiding behind the sofa trying to get out until the hubby came out and was like 'the bed is shaking' now we live on the 2nd floor so if there was a tremor should we be feeling up here. I was a bit freaked out actually, I'll have to watch the local news tomorrow see if theres any info on it. But it was definitely something...oh scarey....