Yes, stress can definitely be a factor. With the way Lois lives, dangling above the jaws of death each week, it's more than likely she has irregular periods.
Irregular periods often happen when you ask a lot of your body. Constant stress, lots of worries, diets, sports... it's all a reason. And it's been said that if you worry your period is late, it's really going to be late.
Saskia
