13 DPO: Most Pregnancies Show Up on a Test Now
Tests are now reliable for most pregnancies. Your dates may not be.
By 
At thirteen days past ovulation, the hCG numbers have moved firmly in favor of testing. If you are pregnant and your ovulation date is right, most home tests should now pick it up. That shifts the main question. A negative today is less about test sensitivity and more about whether your DPO count is accurate. This page explains both.
What happens at 13 DPO
If you are pregnant, the embryo implanted days ago and hCG has been climbing steadily. If you are not, your period may arrive any day now, depending on the length of your luteal phase.
13 DPO symptoms and no symptoms
Thirteen DPO often brings premenstrual-type symptoms: cramps, tender breasts, low mood or tiredness. In early pregnancy those can feel exactly the same. Having no symptoms does not rule out pregnancy: in a prospective study, half of women who went on to have a baby first noticed symptoms only by day 36 after their last period began.7 Feeling nothing now is common either way.
Can you get a positive pregnancy test at 13 DPO?
Yes, in most pregnancies. In daily urine samples from 109 women who conceived, median hCG at 13 DPO was 75.25 mIU/mL, and 90% were above 29.02 mIU/mL.1 That is above the threshold of most home tests on the market.
Studies of tests at the time of the missed period show how much sensitivity still matters for the minority with lower levels:
| Finding | Source |
|---|---|
| A test needs about 12.5 mIU/mL sensitivity to detect 95% of pregnancies at the missed period | Cole 20042 |
| A test needing 100 mIU/mL would detect only about 16% at the missed period | Cole 20042 |
| First Response manual and digital tests (about 5.5 mIU/mL) detected 97% of 120 pregnancies on the day of the missed period | Cole 20113 |
| Other brands tested in 2011 detected 54% to 67% | Cole 20113 |
13 DPO BFN: is your count right?
If your test is negative at 13 DPO, the most likely reasons are that you are not pregnant this cycle or that you ovulated later than you think. Late ovulation is a real and measurable effect. An NIH study measured implantation directly in 136 clinical pregnancies and found that 14 (10%) had not yet implanted by the first day of the missed period, based on the women's usual cycle length.4 Ovulation simply came later than expected.
If your ovulation date came from an app's prediction or a calendar, consider that you might be 10 or 11 DPO rather than 13. The FDA suggests retesting after several days if you still think you might be pregnant, and notes that first-morning urine usually has more hCG.6
13 DPO and implantation
By 13 DPO, implantation should be over for continuing pregnancies, and our implantation bleeding guide explains why spotting now is more likely to be the start of a period. If you bleed after a positive test, that can be an early loss; our page on chemical pregnancy covers it.
With a positive test, see a clinician promptly if you have pain on one side of the pelvis or abnormal bleeding, which can be signs of an ectopic pregnancy. Call 911 or go to the ER for severe, sudden lower belly pain, shoulder pain, or fainting or feeling faint.5
What to do now
Positive? Book an appointment with your clinician. Our first prenatal appointment guide explains what to expect.
Negative, no period? Retest at 14 or 15 DPO, ideally with a sensitive test and first-morning urine. Use the DPO calculator to check your dates.
Period started? Take a moment. Our page on coping with the two-week wait also covers the end of a cycle. Not pregnant this cycle? Track smarter next time, so your next DPO count is based on a confirmed ovulation rather than a guess. Next: 14 DPO.
Frequently asked questions
This page is educational and is not medical advice. Talk to a clinician about your own situation, and seek urgent care for heavy bleeding, severe pain or fainting.
Keep reading
12 DPO: What a Positive or Negative Test Means Now
At 12 DPO most pregnancies have hCG a sensitive test can find. What a 12 DPO BFN means, why your period may be due, when to retest and when to see a doctor.
14 DPO: Your Test Result and What Comes Next
14 DPO is around the missed period for many. How accurate a test is now, what a 14 DPO BFN means, when to retest, and when to see a doctor.
How Many Days After Ovulation Can You Take a Pregnancy Test?
How many days after ovulation you can test: hCG by day past ovulation, which test sensitivity works on which DPO, and when a negative result is reliable.
Implantation Bleeding: What It Is, When It Happens and What It Means
What implantation bleeding is, how common it really is, when it happens, what it looks like, how it differs from a period and when to test or call a doctor.
DPO Calculator
Free DPO calculator: find how many days past ovulation you are, when implantation usually happens, and the earliest and most reliable days to take a pregnancy test.
Sources
- 1Strips of Hope: Accuracy of Home Pregnancy Tests and New Developments. Geburtshilfe und Frauenheilkunde. Gnoth C, Johnson S, 2014. Table 2: daily urine hCG by day since ovulation in 109 UK women. Johnson is employed by the maker of Clearblue tests
- 2Accuracy of home pregnancy tests at the time of missed menses. American Journal of Obstetrics and Gynecology. Cole LA, Khanlian SA, Sutton JM, Davies S, Rayburn WF, 2004. 18 brands tested
- 3The utility of six over-the-counter (home) pregnancy tests. Clinical Chemistry and Laboratory Medicine. Cole LA, 2011. Six home tests; 120 pregnancies on the day of missed menses
- 4Natural limits of pregnancy testing in relation to the expected menstrual period. JAMA. Wilcox AJ, Baird DD, Dunson D, McChesney R, Weinberg CR, 2001. 136 clinical pregnancies
- 5Ectopic pregnancy. MedlinePlus (U.S. National Library of Medicine). Reviewed March 2026. Symptoms and emergency warning signs
- 6Pregnancy (home use tests). U.S. Food and Drug Administration. FDA consumer guidance on home pregnancy tests
- 7A prospective study of the onset of symptoms of pregnancy. Journal of Clinical Epidemiology. Sayle AE et al., 2002. 136 live births