confused?

Hey ladies! My period has been MIA for 6 days now. I took a test last night, and it came back negative. I feel cramps right in the middle of the top of my bladder/uterus area on and off for the last 4-5 days. I'm not sure if my period is just off, or I haven't been paying attention to my cycles. Is there a possibility i could be pregnant and have maybe tested too early?