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Implantation is the process by which a fertilized ovum (egg) implants into the uterine wall to obtain oxygen and nutrients from the mother. This usually occurs between 6 and 8 days after conception. Conception itself can occur anywhere between a few hours and 5 days after intercourse. This is because sperm can live inside your uterus and fallopian tubes for up to 5 days. If during that period you ovulate (release and egg from your ovary), then the sperm can come into contact with the ovum to make an embryo.
Ovulation usually occurs 14 days before the menstrual period, but even in women with very regular cycles, the timing may vary by a couple of days. The next event, fertilization, can also vary, depending on the timing of intercourse. Finally, the time between fertilization and implantation can be between 6 and 12 days. Other factors that determine the accuracy of a pregnancy test include: Given all these factors, a urine test for pregnancy will almost always be accurate a week after your expected period. If you need to know sooner than that or are still uncertain, your doctor can send you for a blood test.