Im pretty sure you can test now, however, you will need to follow the instructions for testing early, and make sure you get a test that allows you to test early. First Response is a good brand. I got a positive at 10 days past ovulation. I'd get a 2 or 3 pack though, because if your 1st test is negative, test again in 2 days, or the following morning if you're as impatient as I am. Make sure you use your first urine of the morning for testing. Good luck.