Trying to conceive, with your cycle on record
Log your period, any spotting and each ovulation test. The app keeps the dates in order and shows estimated fertile days, so you're not counting on your fingers every month.
You can get pregnant from sex in the 5 days before ovulation, on the day itself and the day after. In an average 28-day cycle, ovulation falls about 14 days before the next period, though it moves from cycle to cycle.[1]
Her Good Days records your periods and test results and shows an estimated fertile window. It's a record and an estimate, with no guarantee in either direction.
A month in the log
When you choose "trying" in the cycle settings, your Log menu leads with these:
- Ovulation test: positive or negative, with the time you took it.
- Period: the first day matters most, because every estimate counts from it.
- Temperature (BBT): your waking temperature, if you take it.
- Cervical fluid and Sex: for the days around your estimated fertile window.
Prenatal vitamins go under Medication, with a daily reminder if you want one.
Bringing it to a doctor
ACOG recommends a fertility check after 12 months of trying, or after 6 months if you're over 35. Over 40, talk to your doctor now.[2] If your periods are irregular, or you have none, the NHS says to see a doctor.[3]
The doctor report prints your cycle lengths, period dates and test results, which is often the first thing a fertility appointment asks for.
Your data, kept close
Fertility and pregnancy entries are among the most sensitive things you can put in an app. Notifications never say what you logged, and you can delete everything from settings. More on privacy.
Other life stages
Periods and cycle
Period dates, flow, cramps and PMS.
Pregnancy
Your week, appointments and symptoms.
Postpartum
Recovery, broken sleep and mood after birth.
Perimenopause
Changing cycles and new symptoms, in one log.
Menopause
Hot flashes, night sweats and sleep.
After menopause
Strength, bones, sleep and medication.
Teens
First periods, with teen mode for 13 to 17.
The features for this stage
The screens you would use most. Every feature in the app
Questions
When is the fertile window?
ACOG says you can get pregnant from sex anywhere from 5 days before ovulation until 1 day after it. In a 28-day cycle ovulation happens about 14 days before the next period, but that varies, which is why the app shows it as an estimate.
Does the app predict when I will get pregnant?
No. It keeps your period dates, test results and notes, and shows estimated fertile days from your cycle lengths. It makes no fertility predictions and no promises.
Can I use it to avoid pregnancy?
No. The estimates aren't birth control and should never be used to prevent a pregnancy.
When should we see a doctor?
ACOG recommends a fertility check after a year of trying, after 6 months if you're over 35, and a talk with your doctor straight away if you're over 40. If your periods are irregular, the NHS says to see a doctor.
Sources
- ACOG: Fertility awareness-based methods of family planning Checked October 30, 2026
- ACOG: Evaluating infertility Checked October 30, 2026
- NHS: Irregular periods Checked October 30, 2026
Spotted an error? Write to [email protected]. How we check health information.