You might be tempted to do a pregnancy test at 11 DPO just to see if you get a positive test result. However, your hCG levels are likely to be low at this time, so you run an increased risk of getting a false-negative result. If you notice a faint line on your pregnancy test at 11 DPO, then this may indicate that you are pregnant but your hCG levels are still very low. Take another test on the first day of your missed period.