The answer is based on a couple of factors, mostly your knowledge of your own menstrual cycle!
If You Know Your Ovulation Date and Luteal Phase
If you know your ovulation date and your luteal phase length, you can test the day after your luteal phase is over. For instance, if you ovulated on January 15th and your luteal phase is normally 13 days, you can test on January 29th.
If You Know Your Ovulation Date but Not Your Luteal Phase
If you know your ovulation date but have no idea your average luteal phase, you can assume it is the average of four teen days and test on the fifteenth date after your ovulation. For example, if you ovulated on January 15th, you can test on January 30th.
If You Know Your Average Cycle Length
If you know your average cycle length, you can test the day after that cycle is over. For instance, if your average cycle length is 30 days and your last period started on January 1st, you can test on January 31st.
If You Know Nothing About Your Cycle
Assume it is the average of 28 days and test on the 29th day after your last period. For example, if your last period started on January 1st, you can test on January 29th.
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