Period is supposed to come..


So I'm a little crazy, I track my period with 3-4 different apps. I know my cycle has been a little different every time in the past. Now that I'm ttc #2 I decided to test them out to find one that is the most accurate. The dates that have been given for my period is 16th (today) still time for it to come, 17th, 20th, or 22nd. At what point would you wait to take a test? The 22nd will be 3 weeks and 6 days after my last period.