conceiving after cycle

Have any of you ladies ever gotten pregnant right after your period has ended like you in this mess again other have sex a week 2 weeks or 3 weeks before your cycle starts and you get your cycle and then afterwards you conceive and get a positive pregnancy test and miss your next cycle from the month afterwards is this possible I believe it happened to me with my first child and not sure if it's happening to me right now I took a pregnancy test 3 days ago and was supposed to start my period yesterday but got it this morning what could it be possible I still get pregnant afterwards from having sex on July 6