What tips should I keep in mind?

First morning urine gives the highest HCG concentration and most accurate results. A negative test before your missed period does not mean you are not pregnant. Early detection tests can work 4-5 days before your expected period.

Pregnancy Test Timing Calculator

Determine the best day to take a pregnancy test based on cycle, ovulation, or IVF transfer date for most accurate results.

Tracking Method(How you are determining timing)

Reference Day of Cycle(Day 1 = first day of last period, or transfer day)

Cycle Length (days)(Only needed if using period date)

Test Sensitivity(Early detection tests are more sensitive)

Results

Visualization

How It Works

Pregnancy tests detect HCG hormone in urine. Accuracy depends on when implantation occurred and how much HCG has accumulated. Testing too early gives false negatives.

The Formula

Test Day = Implantation Day + Sensitivity Delay

HCG doubles every ~48 hours, reaching detectable levels 2-5 days after implantation

Variables

mIU/mL — Milli-international units per milliliter — HCG concentration unit
DPO — Days Past Ovulation

Worked Example

Ovulation Day 14, implantation Day 23, standard test: earliest Day 27, reliable Day 30 (2 days after missed period).

Practical Tips

First morning urine gives the highest HCG concentration and most accurate results.
A negative test before your missed period does not mean you are not pregnant.
Early detection tests can work 4-5 days before your expected period.
After IVF, wait at least 9-11 days post-transfer to avoid trigger shot false positives.
If the test is negative but your period does not start, retest in 2-3 days.

Last updated: March 15, 2026 · Reviewed by the FertilityCalcs Editorial Team