Shan - it really depends on the strength of the pregnancy test. Some claim to work before your period is due, however I strongly recommend not testing until AF is late. I have gotten to know a lot of women in here, and some of them have regretted testing earlier than that because they went on to loose the baby after only a few days. Better to wait until AF (Aunty Flo = your period) is late. AF is usually due 14 days after you ovulate. Good luck!