My HormonologyIf you have a complex or challenging project you’ve been meaning to tackle–say, learning how to use a new camera, putting together a report or assembling furniture that comes in 100 different pieces–aim to do it in Week 2 of your cycle, which starts 8 days from the onset of your period. A 2013 study in the journal Psychoneuroendocrinology shows that as your estrogen level rises throughout this week, it improves working memory, which helps you juggle multiple pieces of information at once. And that’s key since this helps you understand and follow instructions and keep track of separate parts of a task, making the project easier and faster to do than any other week of your cycle.