Sensing that your pregnant 😕

Marie • ttc#1 🌈👶🏽 • age 25 • engaged💍
Has anyone ever just sensed that they were pregnant and really was, me and my bf had sex on the 18th which was the day of my ovulation , he came inside of me and idk every since then I've just been feeling a little off, I'm not sure if it's in my head or if this is the real thing. can someone help please.