Your period is due
Choose Expected period when you know your next period date. Enter the date your period should start.
Pregnancy tools
Pregnancy test
calculator
Calculate when to take a pregnancy test.
Enter a period date or the latest unprotected sex date. Get a suggested testing date from your cycle details.
No account requiredSources: NHS & FDA
Calculate your date
Choose a method
Repeat after a few days if pregnancy remains possible. Contact a healthcare professional after another negative result without a period.
Any later unprotected sex creates a separate testing interval.
The calculator estimates timing and cannot confirm a pregnancy. Follow your fertility clinic schedule after IVF or treatment.
When to test
When should I take a pregnancy test?
Take a home pregnancy test from the first day of a missed period.
Your period date is unknown
Test at least 21 days after your latest unprotected sex. Choose Date of sex to calculate your testing date.
You want to test early
Some sensitive kits detect pregnancy before a missed period. A negative result at that stage can miss pregnancy. Check the early-testing instructions for your specific kit.
The calculation
How does the pregnancy test calculator work?
The calculator uses your selected method to estimate a testing date.
Count days from one period start to the next period start. Enter whole numbers from 21 to 45 days. The range limits entries; it cannot assess menstrual health.
Calculate your testing dateThree methods
- Expected period
- Your entered period dateNext period date available
- Last period
- Period start + cycle lengthUse the first day of your last period
- Date of sex
- Latest occasion + 21 daysNext period date unknown
Calendar dates appear after you submit your own information.
Early testing
Why can an early pregnancy test show negative?
A false negative pregnancy test misses an existing pregnancy. Early testing can miss low urine hCG levels. Pregnancy tests detect hCG, the hormone human chorionic gonadotropin.
10–20
out of 100 pregnant people
They may receive negative results on the first missed-period day.
Source: FDA early detection data
Hormone levels and timing vary
The placenta starts producing hCG after an embryo attaches inside the uterus. Ovulation timing, implantation timing, and test sensitivity affect early detection.
Use the suggested date as a starting point for testing. The calculator cannot predict an individual hCG level or guarantee a positive result.
Before testing
How do I take a home pregnancy test correctly?
Follow the package instructions for sampling, waiting, and reading your result.
- 01
Check the kit
Check the expiry date before opening your pregnancy test. Read the instructions because sampling steps differ between brands.
- 02
Choose your urine sample
First-morning urine can improve detection when hormone levels remain low. Avoid drinking large amounts of water immediately before testing. Extra fluid can dilute hCG in your urine.
- 03
Time the result
Set a timer for the reading interval on the package. Check for the required control line or symbol.
After testing
What should I do after a pregnancy test?
Use the result and your symptoms to choose the next step.
Positive result
Contact a healthcare professional
A positive home pregnancy test strongly suggests pregnancy. Arrange an appointment to discuss confirmation and next steps.
Mention any fertility medicine containing hCG during that discussion. Such medicines can produce positive results without a new pregnancy.
Source: OWH pregnancy tests
Negative result, no period
Repeat after a few days
Repeat the test after a few days if pregnancy remains possible. Use the package instructions when checking your next result.
Contact a healthcare professional after another negative result without a period.
When should I seek urgent medical help?
Seek urgent medical advice for one-sided lower abdominal pain or shoulder-tip pain. Mention possible pregnancy even with a negative test result.
Call emergency services for sudden severe abdominal pain with dizziness or fainting.
Source: NHS ectopic pregnancy symptoms
Irregular periods
When should I test with irregular periods?
Choose Date of sex when you cannot predict your next period. Enter the most recent occasion of unprotected sex.
A cycle average can produce an inaccurate expected period date. Any later unprotected sex creates a separate testing interval.
Calculate from the latest occasionMore testing questions
Pregnancy test questions
Check the answers for morning testing, faint lines, medicines, and fertility treatment.
How many days after ovulation can I take a pregnancy test?
Urine hCG may become detectable around 12–15 days after ovulation. The FDA describes that interval for a 28-day menstrual cycle.
Earlier negatives remain possible because hormone levels and test sensitivity vary. Use your expected period date when choosing a testing day.
Source: FDA testing after ovulation
Can I take a pregnancy test at night?
Yes, you can take a pregnancy test at night. First-morning urine can improve detection when you test early.
Follow the sampling instructions for the kit you purchase.
Source: FDA urine sample recommendations
Does a faint line count as a positive result?
A faint coloured test line can indicate pregnancy within the reading window. Confirm that the control indicator appears as the instructions describe.
An evaporation line can appear after urine dries on the test. Ignore changes outside the reading window printed on the package. Ask a healthcare professional about repeated unclear or conflicting results.
What should I do if the control line is missing?
A missing required control indicator makes the result invalid. Repeat with a new kit, following the package instructions.
Source: MedlinePlus control indicators
Can birth control pills affect a pregnancy test?
Birth control pills and antibiotics generally leave pregnancy test accuracy unchanged. Fertility medicines containing hCG can affect results, including producing false positives.
When should I test after IVF or an hCG injection?
Follow the testing date from your fertility clinic after treatment. An hCG injection can cause a positive result before pregnancy confirmation.
The calculator excludes embryo transfer dates and fertility medicine schedules.
Can a blood test detect pregnancy earlier?
A blood test can detect smaller hCG amounts than a urine test. A healthcare professional can arrange testing when your situation requires it.
A quantitative blood test measures the amount of hCG present.
Can an online pregnancy calculator confirm pregnancy?
An online calculator estimates timing from the dates you enter. Only a pregnancy test checks your urine or blood for hCG. Symptoms and calendar estimates cannot confirm pregnancy on their own.
Sources and editorial information
Medical references and calculator limits
The calculator applies calendar intervals from published pregnancy testing recommendations. A healthcare professional can assess individual symptoms and test results.
The tool calculates dates locally without sending entries to our server.
Mom News Daily · Editorial policy
- NHS: doing a pregnancy testMissed periods, unknown dates, and repeat testing
- FDA: home pregnancy testsEarly detection, ovulation, and urine concentration
- MedlinePlus: pregnancy testsKit instructions, control indicators, and blood tests
- OWH: pregnancy testsPositive results and hCG medicines
- Mayo Clinic: home pregnancy testsMedicines and false results
- Cleveland Clinic: pregnancy testsFaint lines and evaporation lines
- NHS: ectopic pregnancy symptomsSymptoms requiring urgent medical attention
