Signs?

Okay so i tried conceiving 21st and my ovulation started the 23 i heard if you try 2 days before ovulation them theres a huge chance to get pregnant. Now im randomly getting signs of pregnancy like having dreams about it. Even on the chrome book for my classes theres ads about pregnancy.. could this be a sign?? Or am i crazy. Have any of you gals experienced this while trying to conceive and turned our pregnant.