Yes, day one of your cycle is the first day of your period. Fourteen days would be the 25th because 11 + 14 = 25. However, they are finding a lot of women ovulate around day 7. When a woman ovulates is not clockwork, however. You could ovulate on day 8, 9, 10, 11, etc. Each woman's cycle is different. These figures (day 7/day 14) are statistical averages of a sample population at the time a study is conducted rather than when each and every woman in the study ovulated.
And when people say u ovulate 14 days after your period is that from the first day of your period??????? So if I started on the 11th 14 days would be 23 or 24th....