periods.day
Pulling out & fertile days
Understand the cycle first
Explore estimated fertile days together. No date on this calendar makes withdrawal reliable or unprotected sex risk-free.
Use period days your partner chooses to share. Lower estimated fertility is never a green light for unprotected sex.
Period days logged
0 days
Estimated cycle length
28 days
Typical period length
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Log period dates she agrees to share. Hover or hold a date to see an estimate, not a safe day.
01
Enter period days with your partner’s agreement. The model highlights estimated cycle phases, not measured hormone levels.
02
Hover or hold a date for context. Ovulation can move, and sperm can survive for days; lower does not mean zero.
03
Discuss contraception and condoms together. A calendar cannot replace a reliable pregnancy-prevention plan or ongoing consent.
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.
There is no calendar date that guarantees withdrawal will prevent pregnancy. Period predictions cannot confirm ovulation, and withdrawal itself can fail. Use contraception if avoiding pregnancy matters to you.
No. Shorter or shifting cycles and sperm survival can allow pregnancy from sex during bleeding. Bleeding is not proof of a safe day.
No. Fertility-awareness methods require specific instruction and monitoring, such as temperature and cervical mucus. This app only models period dates and must not be used as contraception.