hCG Levels / Pregnancy Test Timing Calculator
When Should I Take a Pregnancy Test?
Choose your method — get the exact date to test for accurate results
Know when you ovulated? This is the most precise method — hCG becomes detectable 10–14 days after ovulation.
Please select your ovulation date.
Use your OPK peak day, BBT temp rise, or our Ovulation Calculator
Don't know your ovulation date? Enter your last period and cycle length — we'll estimate ovulation and calculate from there.
Please select your last period date.
For IVF pregnancies, the timing of your beta hCG test is based on your embryo transfer date and embryo age.
Please select your transfer date.
Most IVF cycles use Day 5 blastocysts
Earliest Test Date
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10 DPO — may show faint line
Best Test Date
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14 DPO — most accurate
DPO Today
—
days past ovulation
Days Until Test
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until best test date
🧪 Which Test Should I Use?
📈 Your hCG Level Timeline
hCG (human chorionic gonadotropin) doubles approximately every 48–72 hours in early pregnancy. Here is an estimate of what to expect each day past ovulation:
🏷️ Test Sensitivity Guide
Different pregnancy tests detect different levels of hCG. Lower mIU/mL = more sensitive = can detect earlier. Here is how common brands compare:
* Sensitivity ratings are based on manufacturer specifications and independent testing. Results may vary.
Always test with your first morning urine — it has the highest concentration of hCG and gives the most accurate result.
How Does the Test Timing Calculator Work?
After ovulation, if fertilisation occurs, a fertilised egg implants into the uterine lining between days 6 and 12 past ovulation (DPO). Only after implantation does the body begin producing hCG — the hormone detected by pregnancy tests.
hCG levels start very low and roughly double every 48–72 hours. Most standard tests detect hCG at 25 mIU/mL, which is typically reached around 14 DPO. Early detection tests can detect as low as 6–10 mIU/mL — from around 10 DPO — but false negatives are common this early.
Testing too early is the most common cause of a false negative. Waiting until 14 DPO — or the first day of your missed period — gives the most reliable result regardless of which brand you use.
Frequently Asked Questions
DPO stands for "Days Past Ovulation." It is the number of days since you ovulated. Pregnancy tests work by detecting hCG, which only starts rising after implantation — typically 6–12 DPO. Testing before 10 DPO is very likely to produce a false negative even in a successful conception.
Yes. If you tested before 14 DPO, hCG levels may simply not be high enough to detect yet. Wait 48 hours and test again — particularly with first morning urine. If your period still has not arrived by 16 DPO and tests are negative, consult your doctor.
First morning urine (FMU) is the most concentrated of the day — it has not been diluted by the fluids you drink during the day. This concentration maximises the chance of detecting low levels of hCG, especially in the early days of a pregnancy.
An evaporation line (evap line) appears after the test's reading window has closed — usually after 10 minutes. A faint positive appears within the reading window and has a slight colour (pink or blue depending on the brand). Always read results within the time specified in the instructions.
A test that is positive and then negative (on a fresh test the next day) may indicate a chemical pregnancy — an early pregnancy loss. This is more common than many realise. If this happens, speak to your doctor for confirmation and support.
This tool is for informational purposes only. hCG level estimates are approximations based on average data and will vary between individuals. Always consult your healthcare provider for medical advice.