Why did i start my period almost two weeks after my last one ended? no stds or stis, no hormonal imbalance so i'm confused on why i would start again

Any stress?: stress is the number one reason sex hormones fluctuate. there could be certainly other possibilities, but if u can identify a stressor or stressful time of recent, this is the most likely scenario. Stress lowers levels of DHEA/testosterone, which lowers estrogen levels, which will cause uterine inner wall shedding, leading to bleeding.