Sex and/or exercise

My husband and I are trying to conceive...I was supposed to get my period on Sunday the 21st...I started working out on the Wednesday before (on the 17th)... very lightly like 30 min total per day nothing too intense. My hubby and I also had sex on Sat night... I haven't gotten my period, so now I'm officiality five days late... Am I pregnant or could working out or sex could've stopped it from coming? Help ?