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If you have 28-day cycles, you likely ovulated on 10/12/07, but the day you conceived could have been that day or the day after, depending on how long it took the sperm to reach the egg. If your cycles are longer than 28 days, add an extra day to the 10/12 date for each extra day in the cycle (for example...30 day cycles, probable ovulation was 10/14).