Implant bleeding is rare but if it did happen, it would be very light and hardly noticeable. It would also have happened 7 - 10 days past ovulation. As the previous poster said, it is possible to bleed/spot during pregnancy, so take a HPT to be sure.
Ovulation calendars only work some of the time. They are based on assuming women have 28 day cycles, which many do not. Even if you did have a 28 day cycle, you could ovulate on day 7, 10, 18 or any where in between. Even if you use an online calendar that asks you how many days your cycles are, it still can't say when you were fertile. Some women start their periods 10 days after ovulating, some start their periods 16 or more days after ovulating...
Only by charting BBT (basal body tempratures) and CM (cervical mucus) can you acurately identify your ovulation. OPK's can also be used, but they are not reliable for some women.
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