I had what I thought was a period on January 28, 2018. I have been with one guy until February 9, 2018. I slept with a different guy! I'm due November 4, 2018. I'm not even sure if my period in January was a period. Because I also had a period at the beginning of January! According to my ultrasound I'm due Nov 4, 2018. What day could I have possibly concieved, bc I'm trying to figure out who the daddy could be!!