6 days past period and still nothing 😥

Me and my husband have being trying for a baby for over a year and my periods are always on Time bang on the day ... I was due my period on the 14th of August and nothing's happened I waited a few days to take a test .. It was negative and I've taken one every morning since and still negative ..... I feel really confused and trying not to get my hopes up ? Any advice ? I've being using strip tests should I use a different type ? Thanks in advance lovelies :)