Home pregnancy tests have become more accurate in the last decade, but you should always check with your healthcare provider if the results are negative and you think you might be pregnant.
In the case you do need an additional pregnancy test, your doctor is able to perform a blood test in his or her office that can diagnose a very early pregnancy and/or confirm the results of an at-home pregnancy test. These blood tests are very accurate and can detect pregnancy as soon as the second week of conception.
You can conduct an at-home pregnancy test by testing a sample of your urine as early as around the time your period is due. Always talk with your doctor to confirm a positive at-home pregnancy test with a more reliable pregnancy test and physical exam.
Louise E. Wilkins-Haug, MD, PhD is the Division Director of Maternal Fetal Medicine and Reproductive Genetics at Brigham and Women’s Hospital