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It's impossible to know when you're ovulating unless you test it.
It depends on what you define testing as. You can track your body temperature since there are notable changes in body temperature during and near ovulation, There's vaginal secretion checks since secretions change during ovulation. Then there are more accurate hormonal tests.
Additionally, some women can know with certain symptoms. Some experience pain in the pelvic area during ovulation, known as mittelschmerz
The rhythm method is not as successful as consistent birth control compared to other approaches, but some women can use it successfully. I would not recommend it for most women who do not wish to become pregnant or would not want to deal with the possibility of accidental pregnancy.