I don't know...

Okay so I should be getting my period in the next two days sometime. Well I have had constant abdominal cramping for the last 2 days and waves of nausea for the last week that comes and goes. I haven't gotten a period yet but I am too scared to test tomorrow morning because I start crying every time I get a negative test month after month. I don't feel any other symptoms but I don't know what to think....