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Depending on how they base your due date as well. They usually place you 0-day to the last day of your period and start counting on that. So based upon that you can probably place conception sometime after that date.
Another thing to consider is that conception and implantation doesn't need to occur at or around the sexual encounter. You could have had a one night stand on Friday, conceived on Sunday during mass, and implantation could be another week. So even going back from the implantation or conception date can be misleading.
You can only really guestimate unless you only have sex one day a week at a precise hour.
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