this may seem silly but I'm having a hard time figuring out my date of conception, my first day of my last period was the 9th of September, I had unprotected sex the day before (the 8th) and my period was very light and lasted 3 days, I had unprotected sex two weeks later (the 29th of September) and I haven't menstruated since, I went to the doctor on October 31st and she said I was 6 weeks and 1 day along that's the week in between but closer to the day before my period. what day did I most likely get pregnant?