Can i be pregnant four days after ovulation

A pregnancy test becomes positive only after the fertilized egg has implanted into the uterus and sent enough hCG (i.e. After ovulation and fertilization the fertilized egg or blastocyst takes 4-5 days to travel through the Fallopian tube towards the uterus and it then usually implants inside the uterus.
Blood Pregnancy Test: If you are pregnant then the blood pregnancy test is usually positive within 3-4 days after implantation or about 9-10 days after fertilization and ovulation. Urine Home Pregnancy Test (HPT): The urine pregnancy test will usually not become positive in most women until a missed period or about a week after implantation. Timing of Implantation: A pregnancy test detects the presence of the pregnancy hormone hCG (human chorionic gonadotropin) either in the blood or in the urine. Sensitivity of Urine Home Pregnancy Test: Different pregnancy tests have different sensitivities, which affects how soon a pregnancy can be detected.
The urine test is usually positive at a missed period, but only about 25% of pregnant women will test positive with the HPT 2 days before a missed period, and about 40% the day before the missed period.

However, the day of ovulation is important too, as implantation can only happen if ovulation took place and the egg was fertilized.
The hCG in the urine comes from the hCG in the blood after being filtered through the kidney. On average, a pregnancy test will be positive 13-14 days after ovulation and fertilization, or about the time you expect your menstrual period.
Therefore, if your day of ovulation was later than you thought, implantation and subsequently the positive pregnancy test will also be delayed.
After ovulation, the egg gets fertilized and travels through the fallopian tube toward the uterus. If a woman has low blood hCG levels, for example, it can take several more days for it to show up on a pregnancy test. Make sure you read the package of the pregnancy test to determine your pregnancy test's sensitivity.

At the time of implantation, the placenta starts making the pregnancy hormone hCG, which then enters the blood stream.
How early a pregnancy can be detected depends on the pregnancy hormone hcG, which can be detected in the blood about three to four days after implantation. Detection of hCG depends on timing of implantation, so hCG can normally be detected in the blood between nine and 16 days after ovulation (HPT: 12-19 days after ovulation).

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