Late period

Jossy

I missed my period this month but I’ve been stressing because my daughter was in the hospital for a week. Im studying for some test and not sleeping the hours I’m supposed to plus I work as well. I’ve been getting cramps,lower back pain ,bloated , and acne. I haven’t been sexually active since July 2 but got my period that month. Why haven’t I gotten my period? Would it be all the stress?