Pregnancy Test help

On the day of my missed period I took a pregnancy test at night and it was faulty. In the morning I took one and it said negative.  At night I took one and it was faulty and the one I took this morning didn't display anything. I was wondering if that means there might be a chance I'm pregnant? My period was suppose to start on the 6th. One of my boobs have been itchy a lot and to me they look a bit darker but they could've always been that way