Confused...

Normally I start my period on the 30th of every month so I have a 30 day cycle.. My period came 4 days early last month and came on the 26th so this month I should have started on the 26th right? Or should I be waiting till the 30th. Because I have not started yet.. I am having creamy white discharge instead of the thick pasty white I usually have before my period.. Slight cramps here and there.