First Response, AF due 1/10. Please help😕

Kristen • -Mommy of a 4 year old & 2 angel babies💜-Expecting my Rainbow in March 2017!
My period is due on the 10th, and I got a BFN this morning with FMU. The box says people who test 3 days before have a 99% chance at an accurate result. Does this mean I'm not pregnant? Has anyone gotten a BFN so close to their period and got a positive later on? I've had cramping but I didn't think it was AF.