When is the best time to test for a pregnancy? My boyfriend and I had sex, 15 days ago, on a day glow predicted my ovulation, we used the pull out method a couple of times. Glow always gets my period dates wrong, and I had my normal ovulation pain the end of last week and the beginning of this week. So I'm not sure if I actually ovulated then when we had sex. Anyway my period is due tomorrow or Saturday.. So should I take a test now? Or wait?