I've Had A Cold For A Week Now, And Today

I've had a cold for a week now, and today it finally seemed to be coming to an end. When I blew my nose this morning, my right ear popped, and it has been slowly becoming more uncomfortable. I have tried pouring a cap of peroxide into it, which helped release some pressure, but it feels like I'm wearing an ear muff over that ear now. My friends say it might be an ear infection?