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Quick answer: it depends and you'll probably never know.Not every woman ovulates on day 14 of their cycle. And the number of days in your cycle can differ. And the day of actual implantation varies as well and not every woman has spotting during implantation.The closest you can get is if you where charting and know the day you ovulated, then you can guess in few days range. But all these variables is why pregnancy weeks are tracked from the first day of your last period. Because there's no real way to know. Generaly at your first ultrasound they measure the size of the fetus in order to narrow it down. Mine was only a three day difference from the due date mapping from the menstrual cycle.I know it's probably not the answer you were looking for, but hope it helps.
If your cycle is 28 days and you ovulated 12-14 days after, you would've gotten pregnant between April 11th and April 14th and your due date would be around January 3rd. But like LUTYA said in the previous post, everyone is different and they will be able to narrow it all down at your ultrasound