Need advice!

Kay
 AF was due 3 nights ago. I have a normal 28 day cycle and usually get my period at exactly the same time every month.She is late this month and I have been having cramps the last 3 nights, every time I go to the restroom I think she will be there but she isn't!I've had a little bit of cm but nothing too abnormal.I tested with a dollar store cheapie and got a BFN the day AF was due.I'm going crazy now waiting for her or a BFP.Currently feeling like I'm gonna puke :(Has anyone had cramping and nausea before a BFP?Also how late was your period when you got a BFP?