Depends: There are other factors that may affect the answer, such as if your LMP was regular or not, if you had sex another time but forgot, etc. If above info is accurate, then it is unlikely you conceived on day 3 of your period (10/9/16), but very likely that you conceived during the second or third week of your cycle, which includes 10/23/16. To be sure, I suggest paternity testing, if indicated.
Answered 6/19/2017
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