Yes, you can use a pregnancy test strip if your period is 2 days late and you are unsure about pregnancy. These strips are designed to detect the presence of the hormone hCG in your urine, which is produced during pregnancy. However, it's important to note that for accurate results, it is recommended to wait at least one week after a missed period before taking the test. This allows enough time for the hormone levels to rise and be detected by the test. If you take the test too early, there may not be enough hCG in your system to give an accurate result. Additionally, it's worth mentioning that while home pregnancy tests are generally reliable, they can sometimes produce false negatives or false positives. If you have concerns or doubts about your results, it's best to consult with a healthcare professional for further evaluation and confirmation of your pregnancy status.