Period late

Hello everyone.

I was due for my period about 6 days ago, but they never came. I usually have my period for 3 days - I had the cramps I usually get the day before my period & then during the 3-4 days I should’ve had them I still had the cramps and a few days after also. I have been sick also. However took tests and they said negative. Anyone else have this problem or know what could be wrong? going to doctor but I can’t go till next week.