Period is 8 days late,left leg is slightly aching, overweight, cycle is usually 31 days but at times is also 28/32/35 days, no sex life, first time my periods has crossed the 35 day cycle mark. is it normal for periods to be this late?

Late period ?'s: A history of being overweight and cycles of "31 weeks" can sometimes be extended by stress ( work, Covid, emotional) which delays onset of ovulation, which delays the onset of menstruation. See your gyn provider and ask about low dose oral bcp's, which will stop all ovarian hormones and provide predictable and light bleeding events.