How soon can i take an ovulation prediction test?

Depends: 1. Could be as early as when you stop bleeding 2. In regular cycles-examples 28d-ovulate around day 14 +/-4 [days 10-18) 35d- ovulate 35-14=21 +/-4 (17-25) 3. In women with pcos- particuarly in lean (bmi<25)- if urines are always positive, then can't use opt's 4. Clomid (clomiphene) cycles- must be 4 days after completion of meds, as lh and fsh are increased to help with egg recruitment. Hope that helps!