Hi, Yellowpink, it sounds like you conceived around October 24. Have you had any ultrasounds? That might help you convince yourself that sex a month earlier followed by a period is proof positive that you were not pregnant. The baby will look very different on an ultrasound if it was conceived September 19 or October 24.
I'm in the same dilemma different dates. I've gotten answers on this post but my anxiety still takes control sometimes.