Can you get pregnant 2 days before ovulation

is it possible to get pregnant 2 days before the ovulation calender says. ex: it says I was ovulating on the 17th had sex on the 15th... It also said to test on the 26th but It wasn't positive till the 30th.... Did I ovulate later then the 17th? I didn't get a positive till two days before my period was due.

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