When to Take a Pregnancy Test: Test Date Calculator
Free pregnancy test calculator: find out when to take a pregnancy test from your last period or ovulation date. See implantation days, the earliest sensitive test day, the day a test is dependable and your days past ovulation (DPO). Private, adds to your phone calendar.
🔒 Private by design: your dates are saved only in this browser (never uploaded, no account) and are shared by the three calculators below.
More options: period length, luteal phase, ovulation (LH) test
Your chances, day by day
Chance of pregnancy from sex on each day, for a typical couple. The two days before ovulation and ovulation day are the peak. Source: Wilcox, Weinberg & Baird, New England Journal of Medicine 1995 (129 couples, 625 cycles). Ovulation can move by a few days, which is why the whole window counts.
Your cycle log
Add the first day of each period you remember. With two or more, the calculator uses your own average instead of the textbook 28 days, and tells you how regular you are.
Upcoming periods
Calendar
Tap a day for details.
Next six cycles
Key dates
Week-by-week calendar (weeks 1–42)
Day by day after ovulation
Week by week
These are estimates from averages, not medical advice or contraception. Bodies vary and cycles change with stress, illness, breastfeeding and age. Talk to a doctor or midwife about your own situation, especially if your cycles are very irregular or you have been trying for 12 months (6 if you are over 35).
When to take a pregnancy test
Enter the first day of your last period and your cycle length (or an ovulation date you know). The calculator counts the days past ovulation (DPO) and tells you when implantation can happen, when the earliest sensitive test is worth trying, and the first day a home test is dependable. Add the dates to your phone calendar so you remember to test.
The short answer
- Implantation happens about 6–12 days after ovulation, most often 8–10.
- hCG, the pregnancy hormone, starts to rise after implantation. A blood test can detect it about 9 DPO; sensitive urine tests from about 10 DPO.
- The day of a missed period (about 14 DPO) is when a home test is dependable. Testing before that can read negative when you are pregnant.
Questions
Why did I get a negative test and then a positive one?
hCG roughly doubles every two to three days in early pregnancy. A test taken a day or two too early may not find enough of it. If you get a negative and still have no period, test again in 2–3 days.
Should I test with the first morning urine?
It helps before the missed period because it is the most concentrated. After the missed period any time of day works.
What about IVF?
A day-5 embryo transfer counts as 5 DPO on the day of transfer, so enter the date you would have ovulated (transfer date minus 5). Clinics usually schedule a blood test about 9–11 days after a blastocyst transfer. Follow your clinic's advice: a home test can be affected by trigger injections.
My cycle is irregular. Can I trust the date?
Not as much: ovulation can be earlier or later than predicted. Use an ovulation (LH) test or a confirmed ovulation date, or simply test 21 days after the last time you could have conceived.
If the test is positive, work out your due date and how many weeks pregnant you are.