Missed period so confused

OK my period was due the 6th and I am two days late the day before my period was due I had cramping and I was really bloated I thought I was going to start by never did I been feeling like I'm going to start my period every Time I go to the bathroom there's nothing and today I feel fine there's no cramps or anything and I did take a pregnancy test the day my period was due and it was negative please help I'm so confused!!!!