2023 Author: Priscilla Miln | [email protected]. Last modified: 2023-05-24 13:23
Thirteenth day after ovulation (13 DPO) and the test is negative? You should not unequivocally assume that “it didn’t work out again”, and get upset in advance. At such a short time, not all tests to determine the concentration of the hCG hormone in the urine will show an accurate result.
From what day to count the delay of menstruation?
Many mistakes in early pregnancy diagnosis happen only because women do not know how to calculate the menstrual cycle. Be sure to have a special calendar. In it, regularly mark the days when menstruation begins and ends. A few months of work with a regular paper calendar or a special smartphone application will allow you to study the features of your menstrual cycle well. This is important for determining the time of ovulation and delay.
Duration of a normal cycle averages 28-30 days. Periodicity is an individual indicator. Therefore, each woman's periods can be both short (3 days) and long (7 days).
Menstruation may start a little earlier or later, and this is notcause for concern. The moment of the onset of menstruation directly depends on external and internal factors: hormonal failure, stress, climate change or time zones, unhe althy diet, women's diseases and, of course, pregnancy.
To understand if this is a delay, or if the cycle has been rearranged a little, you need to refer to the calendar. It marks the end date of the last menstruation. From this day you need to count the usual duration of the cycle. For women with irregular periods, another option has been developed. Here the longest and shortest cycles are added up, and then the resulting figure is divided by two. For accuracy, you can calculate the arithmetic average of the last three to six menstrual cycles. By the way, all this is done by the mobile application itself.
The day of ovulation is determined in the same way. However, with an irregular cycle, it will be more difficult to understand this issue. If the number of days between periods is approximately the same, then it is enough to subtract 12-14 days from this figure. This will be the approximate day of ovulation. Sometimes the release of the egg from the follicle can occur closer to the end of the last menstruation or to the beginning of the next. With an irregular cycle, ovulation can only be determined with the help of special tests.
Why shouldn't you trust the results before the delay?
When will the test show pregnancy, if any? Most special strips can be used from the first day of delay. However, you should be aware that there may benegative test and at 13 dpo. This is not surprising, since with a cycle of 28 days, it falls just on the last one. That is, in fact, there is no delay yet. The concentration of hCG may not yet have reached the required minimum for the test to “react” to it.
The strips have a sensitivity of 20-25 mIU/ml. Before the delay, only expensive and high-quality pregnancy tests can recognize an interesting situation. Already seven to ten days after the expected conception, strips with a sensitivity of 10 mIU / ml can determine whether a woman will become a mother in the next nine months.
Will a test show pregnancy on the 13th day after ovulation (DPO)? After all, almost two weeks have passed, and it seems that this time is enough to determine an interesting situation. In fact, this is a very short period of time. When there is no delay in menstruation (including at 13 DPO), a negative test should not be taken seriously. To get a reliable result, it is better to wait a few more days.
Pregnancy tests for home use respond to the hormone hCG, which begins to be produced only after the attachment of the embryo. Implantation in 18% of cases occurs at 8 DPO, in 36% - at the ninth, and in 27% - at the tenth. On the remaining days from 3 to 12 after ovulation, the probability of implantation is less than 10%. After attachment, the fetal egg should begin to produce hCG - a specific pregnancy hormone (chorionic gonadotropin). In order for the test to accurately determine pregnancy, the hCG level must reach at least 20 mIU / ml.
A negative test at 13 DPO can be with a completed pregnancy. It’s just that the level of the hCG hormone is still insufficient for the reagent to react and clearly show the second strip. But at the same time, some women see a pale line on the tests. This result cannot be considered reliable either. The test should be repeated in a couple of days.
The line of evaporation is also called a “ghost” strip, when the colored trace was, but after a while it became completely invisible. The "Phantom" has the same width and length as the control sample. It is painted in blue, pink or lilac, but is more pale, barely noticeable. Somehow the "ghost" resembles a smoky trail where there should be a brightly colored second stripe.
Negative test at 13 DPO: is there any hope?
Since there is no delay on this day, this result does not mean that there is no pregnancy. Of course, it's hard not to worry when there have already been several unsuccessful attempts to conceive a child. However, you will have to wait. In order to worry less, it is recommended to be distracted. Numerous studies show that a stressed woman has a 12% lower chance of a successful conception.
In the first two weeks after implantation, the level of hCG doubles every 1-2 days. If the fetal egg entered the uterine cavity on the fourth day after ovulation, then at 13 DPO the hCG level will be only 2 mIU / l. At 5 DPO, this figure will increase.up to 4, on the sixth - up to 8, on the seventh - up to 16, and on the eighth - up to 32. An ultrasensitive test will show pregnancy a week after ovulation. Normal - on the eighth day. But this is only if the woman knows exactly the day of ovulation, having determined it not by the schedule or tests, but by ultrasound. After all, the probability of attachment to the third - fifth DPO is only 0.68%. And the fertilized egg can produce hCG at different rates.
If you take the average data, everything will be even slower. For example, implantation occurred on the eighth day after conception, and hCG increases 2 times every two days. Therefore, at 9 DPO, the hormone concentration will be only 2 mIU / ml, at 11 DPO - 4, at 13 DPO - 8, and at 15 DPO - 16. On the first day of the delay, even a qualitative sensitive test will show only a weak second strip. But on the third day you can admire the bright and clear line.
It happens that pregnancy develops even more slowly. It's quite normal. Conception at 10 DPO occurs in 27% of cases. Then hCG "grows" to 16 mIU / ml only on the third day of the delay, or at 17 DPO.
How else can you tell if you're pregnant?
When will the pregnancy test show? It is possible to reliably find out whether an interesting situation caused the delay only on the third or fifth day of the delay. By this time, the level of hCG will reach the required minimum, even if implantation occurs late, and the embryo is in no hurry to synthesize the hormone. If you are impatient to find out if there is a pregnancy, you can do a blood test to detect hCG in the clinic. Blood is taken from a vein in the morning on an empty stomach. The laboratory will also determine the exact gestational age.
For certain diseases or unsuccessful attempts to get pregnant, the doctor may prescribe a medicine. For example, Duphaston. And at 13 DPO, the test was negative. Cancel "Dufaston" in this case or not? Before making a decision, the doctor will send you to the laboratory for a blood test. Further actions will depend on its result. If the pregnancy is confirmed, then Duphaston is usually not canceled for some time. If conception did not take place in this cycle, then the medication should be discarded.