Guides

Clear answers about periods and cycles, each checked against public health bodies and medical colleges, and an honest account of what Bloom does with your data.

• Cycle syncing workouts: should you train by phase?Does training by phase work? What research says, and a flexible plan.
• The follicular phase: what happens, how long it lasts, and energyWhat happens, why it varies, and the post-period energy boost.
• The luteal phase: symptoms, length and cravingsHow long it lasts, why it brings PMS-like symptoms, and cravings.
• A menstrual cycle hormone chart, explainedWhat the curves show, and what makes each hormone rise and fall.
• The four phases of the menstrual cycleWhat happens in each phase, and how long each one lasts.
• How accurate are period tracker apps?What apps predict well, what they don’t, and why.
• How late can a period be before you should worry?What counts as late, when to test, and when not to wait.
• Is my cycle length normal?What counts as normal, and what a 24- or 40-day cycle means.
• PCOS has a new name, PMOS. Here is what it meansWhy PCOS was renamed, and what PMOS means for you.
• An AI period tracker: what it knows, and how far to trust itWhat Bloom AI knows, where your words go, and how far to trust it.
• An app that tells you which phase of your cycle you’re inWhich phase you’re in today, and how Bloom works it out.
• A period tracker without ads (and what that costs)No ads and no ad trackers, what it costs, and how to check any app.
• A cycle syncing app that starts from how you actually feelPlan around your phases, starting from your own check-ins.
• A period tracker for irregular periodsHow Bloom predicts when your cycle won’t sit still.
• Tracking your cycle with PCOS (now called PMOS)What tracking can and can’t tell you with PCOS, now called PMOS.
• A period tracker that doesn’t sell your dataWhat Bloom keeps, who else touches it, and how to delete it all.

Bloom is a wellness and planning app. It is not a medical device, it does not diagnose or treat any condition, and it is not a method of contraception. This page is general information, not medical advice. If something about your cycle worries you, talk to a doctor, nurse or midwife.