13 DPO: the day before your expected period
Updated July 2, 2026
At 13 days past ovulation, also a classic premenstrual symptom, driven by the same progesterone in either case. Can a test detect pregnancy today? Getting reliable: many pregnancies show by now; confirm negatives after your missed period.
13 DPO at a glance
- Test today? Getting reliable. many pregnancies show by now; confirm negatives after your missed period.
- Tender or heavy breasts: Also a classic premenstrual symptom, driven by the same progesterone in either case.
- Mild cramping: Can be pre period cramps just as easily as anything pregnancy related.
- Fatigue: Progesterone is high late in the luteal phase and tires people out whether or not they conceived.
What is happening at 13 DPO?
13 DPO sits at the very end of the luteal phase. For a typical 14 day luteal phase, your period is expected in about a day. The corpus luteum has been releasing progesterone since ovulation, and in a cycle that is not pregnant it is starting to wind down, which is what eventually lets your period begin.
If an embryo implanted, which happens most often 8 to 10 days past ovulation, hCG has been rising for several days and roughly doubling about every two days. By 13 DPO there is often enough to catch on a sensitive test, but not always, because the timing of implantation shifts the whole curve by days.
This is the crux of 13 DPO. Whether you feel like your period is coming or like you might be pregnant, the sensations are largely the same progesterone story. The one thing that changes the picture is hCG, and only a test can see that.
Because the two states look so alike from the outside, most people find the calendar and a test far more useful today than any single symptom they can feel.
Symptoms people notice at 13 DPO
| Symptom | The honest context |
|---|---|
| Tender or heavy breasts | Also a classic premenstrual symptom, driven by the same progesterone in either case. |
| Mild cramping | Can be pre period cramps just as easily as anything pregnancy related. |
| Fatigue | Progesterone is high late in the luteal phase and tires people out whether or not they conceived. |
| Bloating | Very common in the day or two before a period arrives. |
| Light spotting | Could be late implantation type bleeding or simply the very start of your period. |
Should you take a pregnancy test at 13 DPO?
Many pregnancies are detectable at 13 DPO, but a fair number are not, so a negative today is not a reliable no. If you can wait one more day to your expected period, roughly 14 DPO, the result carries more weight because hCG typically becomes reliably detectable around your missed period. Test with first morning urine, when hCG is most concentrated. Only a pregnancy test or a clinician can confirm pregnancy, and if a test is negative but your period does not arrive, retest in 2 to 3 days.
Not sure when you ovulated? The pregnancy test calculator works from your last period date instead.
What your BBT may show at 13 DPO
On a chart, 13 DPO temperatures usually still sit above your coverline whether or not you are pregnant, because progesterone is still elevated. In a cycle that is not pregnant, temperatures often begin sliding toward the coverline right about now as progesterone falls ahead of your period. A reading that stays high is expected either way at this point, so one day tells you little. Some people notice a brief one day dip, and a published analysis by charting site Fertility Friend found that pattern in about 23 percent of pregnancy charts and about 11 percent of non pregnancy charts, so it leans slightly toward pregnancy but is far from a verdict.
Counting days on your fingers? Let Safr count for you
Safr tracks your cycle, estimates your fertile window and expected period, and shows your temperature pattern on an interactive chart.
Common questions at 13 DPO
Can a pregnancy test be positive at 13 DPO?
Often yes. By 13 DPO many people who conceived have enough hCG for a sensitive test to catch, especially with first morning urine. But plenty of real pregnancies are still below the detection line today because implantation happened later. A negative at 13 DPO is not a reliable no. If your period does not come, retest in 2 to 3 days.
What does 13 DPO and no symptoms mean?
Very little on its own. Many pregnancies have no noticeable symptoms this early, and many cycles that end in a period also feel quiet. Symptoms at 13 DPO are driven by progesterone, which behaves the same whether or not you conceived, so their absence neither rules pregnancy in nor out. A test is the reliable next step.
Is 13 DPO too early to test?
It is close but not the strongest day. A home test measures hCG, which typically becomes reliably detectable around your missed period. Testing at 13 DPO can work, but a negative could simply be too early to trust. Waiting until 14 DPO, your expected period, gives a more dependable answer, and only a test can confirm pregnancy.
Keep reading
← 12 DPO · All days 0 to 18 · 14 DPO →
Sources
- Wilcox AJ, Baird DD, Weinberg CR. Time of implantation of the conceptus and loss of pregnancy. N Engl J Med. 1999;340(23):1796-1799.
- Wilcox AJ, Weinberg CR, Baird DD. Timing of sexual intercourse in relation to ovulation. N Engl J Med. 1995;333(23):1517-1521.
- NHS. Doing a pregnancy test. nhs.uk. Accessed July 2026.
- American College of Obstetricians and Gynecologists. Menstruation in girls and adolescents: using the menstrual cycle as a vital sign. Committee Opinion No. 651. 2015.
- Steward K, Raja A. Physiology, ovulation and basal body temperature. StatPearls. 2023.