Help please!!!

Amber • I`m happily engaged to the love of my life been TTC #1 for almost a year?
So I was laying on the couch listening to music on my iPad and my upper stomach moved like literally my iPad moved up and down only twice it was like I got kicked or something from the inside but every pregnancy test I take comes up negative could I be pregnant and not know it? What should I do has anyone else had this happen?