Weird period supposed to start 7-29 although have had 2 out four of my normal PMS symptoms

Lori
my period is supposed to start July 29 I always get the chills and hot flashes before my period although I also get a headache and zits in same place every month. That hasn't happened last night had some cramping weird!!!! Boobs are normally sore a week to two weeks before period and those just got sore yesterday Weird Period??