periods.day
Understand her cycle
Let her choose what to share
A cycle can offer context, but it cannot explain how she feels. Learn about the phases and ask what support she actually wants.
Open a link she sends or add period days with her agreement. The calendar estimates phases, not emotions.
Period days logged
0 days
Estimated cycle length
28 days
Typical period length
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Use dates she agrees to share. Hover or hold a day for cycle context, not a mood forecast.
01
Use only dates she chooses to share. A private cycle link contains sensitive information; do not forward it without permission.
02
Read the phase tooltips. Premenstrual symptoms can happen before bleeding, but not everyone experiences them the same way.
03
Listen to her experience and offer practical support. Let her decide whether to track symptoms or speak with a clinician.
periods.day has no accounts, cookies, analytics, or saved cycle data. Your entries live only in the link.
Anyone with the full link can see your entries. Share the link only with people you trust.
I was tired of having something as simple as tracking my cycle used to target me with ads for period underwear, fast food, or makeup. I wanted to understand my body and what it needs without advertisers exploiting that information. That’s why I built this site.
You cannot tell from cycle dates. Feelings have many causes and deserve to be heard. Some people experience PMS before a period, but it is not a reason to dismiss what your partner says.
PMS describes symptoms in the weeks before a period. Experiences differ between people and cycles. A calendar cannot diagnose it; recording symptoms over at least two cycles can help a clinician assess a pattern.
Ask, listen and respect her answer. Offer the support she wants, whether that is practical help, space or company. If symptoms affect daily life, encourage access to care without deciding for her.