Everyone is different, some women have no signs at all, while others have symptoms right from the on set. I was one of those that had symptoms right away that continued thru my 20th week.....
You can have sore breasts, upset stomach, some even have a UTI, which I had. Backaches, poochy tummy....maybe a small amt of bleeding...that isnt like your normal period.
But as the previous poster said, take a pregnancy test...or go to the doctor and get a blood test.....its the only way to know for sure. Some of those symptoms can be brought on my stress,even the delay of your period....so TAKE a TEST!