period but no period?

Jessica
Hi ladies!
This hasn't happened to me in all the 20 years I've been getting my period.  So my period was supposed to start on Wednesday.  When I wiped there was a tiny amount of brown so I figured yup it's starting and used my feminine products.  When I went to change it hours later there's again a super tiny amount..there was nothing yesterday or today.  I have a sore back and no cramps.  I took a digital test but it was negative. 
Usually I'm on point with my period and if I get some spotting then within a few hours I'm full on red storm.
 
Anyone else have a weird start to their period?