A 2003 studyTrusted Source found that resting metabolic rate (RMR) varies widely across the menstrual cycle
They found some women had a wider variation of changes to their RMR — as much as 10 percent. Other women didn’t have much change at all, sometimes as little as 1.7 percent.
This means calorie burn during a period really may depend on the person. Some people may burn more calories while others don’t really have much difference in the average amount of calories burned.
Another research study published in Proceedings of the Nutrition Society found women have a slightly higher RMR in the luteal phase of their menstrual cycle.
Another researcher reports that RMR may increase during ovulation itself. This is when your body releases an egg for possible fertilization.
A study published in the European Journal of Nutrition found appetite does increase in the week before your period.