I returned to working out at the gym 8 months ago. im 34 yrs&now my period is bet.27 to 28 days instead of 30 days&a week before the period i start to feel nauseous&my muscles ache&that happens with every period.i aint sexually active with no covid?

Menstrual cycles : Menstrual cycles differ in every woman. The length of the cycle can vary from 21-35 days and may involve anything from spotting to heavy bleeding. Various life stressors can change the cycle from month to month. Pregnancy, new meds, illness, travel, weight gain/loss, excessive exercise, STD's, endometriosis, and Polyps can cause changes in periods. If your periods continue irregular see a Dr.