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Every guide on Safe Period, grouped by topic. Free, sourced and reviewed by a clinician before launch.

Ovulation & fertility

Ovulation calculator

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Ovulation discharge: what it looks like

Near ovulation your cervical mucus usually becomes clear, slippery and stretchy — much like raw egg white. This “egg-white” discharge signals your most fertile days; it appears for a few days, peaks around ovulation, then dries up.

Ovulation cramps (mittelschmerz)

Many people feel a mild, one-sided ache low in the abdomen around ovulation — called mittelschmerz (German for “middle pain”). It usually lasts from a few minutes to a couple of days and is generally harmless.

Cervical mucus: a guide to each stage

Cervical mucus changes through your cycle as estrogen rises and falls. Just after your period it is scant or sticky; as you approach ovulation it becomes creamy, then clear, slippery and stretchy like egg white — the sign of your most fertile days. After ovulation it turns thick and dries up.

Pregnancy & early signs

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Due date calculator

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Implantation bleeding vs period: how to tell them apart

Implantation bleeding is light pink or brown spotting that can occur about 10–14 days after ovulation, when a fertilized egg attaches to the uterus. Compared with a period it is lighter, shorter (a few hours to 1–2 days), and arrives a little earlier — and it does not build into a full flow.

How soon can I take a pregnancy test?

For a reliable result, take a home pregnancy test from the first day of your missed period — about 14 days after ovulation. Some sensitive tests can detect pregnancy a few days earlier, but an early negative can still turn positive later.

Early pregnancy symptoms: the first signs

Early pregnancy signs — tender breasts, fatigue, nausea, frequent urination and mood changes — can appear around the time your period is due, sometimes a few days earlier. But they are non-specific and also happen before a period: only a pregnancy test confirms it.

Periods & your cycle

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Period calculator

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Ovulation bleeding and mid-cycle spotting

Light spotting around ovulation is common and usually harmless. A brief dip in estrogen when the egg is released can cause a small amount of pink or light-brown discharge for a day or two in the middle of your cycle.

Why is my period late?

A period that is up to about 7 days late is usually normal. If you are sexually active and more than a week late, take a pregnancy test first. Beyond pregnancy, common causes include stress, weight or exercise changes, thyroid problems and PCOS.

Birth control & the safe period

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Safe period calculator

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Is the “safe period” reliable for avoiding pregnancy?

No. The “safe period” (calendar or rhythm method) is not reliable contraception. Even calculated perfectly it fails about 5% of the time per year; with typical real-world use, 12–24 in 100 people become pregnant within a year — because ovulation shifts and sperm survive for days.

Can you get pregnant on your period?

Yes — it is less likely, but possible. Sperm can survive up to about 5 days, so if you have a short cycle and ovulate early, sperm from sex during your period can still be around when an egg is released. There is no truly “no-risk” day with calendar timing.

Birth control methods compared

The most reliable birth control methods are long-acting ones — the implant and the IUD — with under 1% failure per year. The pill and condoms work well when used correctly, while calendar-based “safe days” fail for 12–24 in 100 people per year.