Need educated answers but anyone can comment please???

My last period was march 23 ended on the 28 I just now today started having some brownish red bleeding which usually means I am about to start my period but the fact that I didn't get it for over 2 months concerns me and was wondering if I should be worried? I have an app that keeps track and they have always been right on time sometimes I have been late by a few days week tops have been early before but they usually are on time I have never been this late and then started???