If a typical cycle is 28 days and ovulation is typically on day 14, then if my cycle is usually 34 days long, is it accurate to say that my ovulation will then be on day 17 ?

No, in fact you are most likely to ovulate around day 20, as the second post ovulatory part of your cycle is usually 14 days. So the calculation is to subtract 14 from your cycle length to give you roughly your ovulation date. However the more your periods deviate in either direction from 28 days the less predictable is the date of ovulation is-so we'd recommend ovulation testing.
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