If you have a regular 28/29 day cycle and the day 21 test shows you're ovulating, does that mean ovulation is occurring around day 14/15? Or if you ovulated on day 9 or 10 for example, would it still show on the day 21 test? Also, if it is the case of ovulation around day 14/15 would you expect a surge to be appearing with opks on day 13? Tried to search this before posting but couldn't find specifics to my situation :-)