My dad had the fish dream?!

Okay so in my family the superstition of "if you dream of fish someone around you is pregnant" is very prominent and believed. My dad claimed to have it the same day me and my boyfriend had sex... twice. We were protected both times and our contraceptives were okay but it's just weird that happened the same day, should I be worried! My periods supposed to start tomorrow but I'm not having discharge of any sort... but I did recently start working out... could that be what pushed it back?