Thank you for your medical query at AskTheDoctor.com
I understand your concern.
Since the first day of your cycle was January 8th, your expected ovulation date would be any day between 22nd to 25th of January. It is difficult to exactly predict, but it is likely to be either 22nd or 24th. It should not be 17th as ovulation is not expected that early.
Hope this was helpful,
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